Здравствуйте, вот форма регистрации XML:
<?xml version="1.0" encoding="utf-8"?>
<form>
   <fieldset name="default"
      label="COM_USERS_REGISTRATION_DEFAULT_LABEL"
   >
      <field name="spacer" type="spacer" class="text"
            label="COM_USERS_REGISTER_REQUIRED"
         />
      <field name="name" type="text"
         description="COM_USERS_REGISTER_NAME_DESC"
         filter="string"
         label="COM_USERS_REGISTER_NAME_LABEL"
         required="true"
         size="30"
      />      
      <field name="name2" type="text"
         description="COM_USERS_REGISTER_NAME_DESC2"
         filter="string"
         label="COM_USERS_REGISTER_NAME_LABEL2"
         required="true"
         size="30"
      />      
      <field name="date" type="text"
         description="COM_USERS_REGISTER_DATE_DESC3"
         filter="string"
         label="COM_USERS_REGISTER_DATE_LABEL3"
         required="true"
         size="30"
      />      
      <field name="job" type="text"
         description="COM_USERS_REGISTER_JOB_DESC4"
         filter="string"
         label="COM_USERS_REGISTER_JOB_LABEL4"
         required="true"
         size="30"
      />                  
            <field 
         name="family" 
         type="radio"
         description="COM_USERS_REGISTER_FAMILY_DESC5"
         filter="string"
         label="COM_USERS_REGISTER_FAMILY_LABEL5"
         required="true"
         size="30"         
      >
      <option value="замужем"></option>
        <option value="не замужем"></option>
      <option value="есть друг"></option>
      <option value="свободна для новых отношений"></option>      
        </field>             
  <field 
         name="children" 
         type="radio"
         description="COM_USERS_REGISTER_CHILDREN_DESC6"
         filter="string"
         label="COM_USERS_REGISTER_CHILDREN_LABEL6"
         required="true"
         size="30"
         >
        <option value="да"></option>
        <option value="нет"></option>
         </field>               
      <field 
         name="hobby" 
         type="radio"
         description="COM_USERS_REGISTER_HOBBY_DESC7"
         filter="string"
         label="COM_USERS_REGISTER_HOBBY_LABEL7"
         required="true"
         size="30"
         >         
        <option value="да"></option>
        <option value="нет"></option>
      </field>            
      <field name="hobbi_ut" type="spacer" class="text"
            label="COM_USERS_REGISTER_HOBBY_UT_LABEL8"
         />      
      <field 
      name="sport" 
      type="text"
      description="COM_USERS_REGISTER_SPORT_DESC"
      filter="string"   
      label="COM_USERS_REGISTER_SPORT_LABEL"
      size="30"
      />                              
      <field 
      name="creation" 
      type="text"
      description="COM_USERS_REGISTER_CREATION_DESC"
      filter="string"   
      label="COM_USERS_REGISTER_CREATION_LABEL"
      size="30"
      />      
      <field 
      name="cookery" 
      type="text"
      description="COM_USERS_REGISTER_COOKERY_DESC"
      filter="string"   
      label="COM_USERS_REGISTER_COOKERY_LABEL"
      size="30"
      />      
      <field 
      name="animals" 
      type="text"
      description="COM_USERS_REGISTER_ANIMALS_DESC"
      filter="string"   
      label="COM_USERS_REGISTER_ANIMALS_LABEL"
      size="30"
      />      
      <field 
      name="otherr" 
      type="text"
      description="COM_USERS_REGISTER_OTHERR_DESC"
      filter="string"   
      label="COM_USERS_REGISTER_OTHERR_LABEL"
      size="30"
      />            
      <field 
      name="sporting" 
      type="list"
      description="COM_USERS_REGISTER_TOPICS_DESC"
      filter="string"
      label="COM_USERS_REGISTER_TOPICS_LABEL"            
      >
      <option value="здоровье, красота"></option>
        <option value="дети, семья"></option>
        <option value="карьера, образование"></option>
      <option value="спорт"></option>
      <option value="кулинария"></option>
      <option value="творчество"></option>
      <option value="мероприятия, развлечения"></option>
 </field>               
      <field name="username" type="text"
         class="validate-username"
         description="COM_USERS_DESIRED_USERNAME"
         filter="username"
         label="COM_USERS_REGISTER_USERNAME_LABEL"
         message="COM_USERS_REGISTER_USERNAME_MESSAGE"
         required="true"
         size="30"
         validate="username"
      />
      <field name="password2" type="password"
         autocomplete="off"
         class="validate-password"
         description="COM_USERS_DESIRED_PASSWORD"
         field="password1"
         filter="raw"
         label="COM_USERS_PROFILE_PASSWORD1_LABEL"
         message="COM_USERS_PROFILE_PASSWORD1_MESSAGE"
         size="30"
         validate="equals"
         required="true"
      />
      <field name="password1" type="password"
         autocomplete="off"
         class="validate-password"
         description="COM_USERS_PROFILE_PASSWORD2_DESC"
         filter="raw"
         label="COM_USERS_PROFILE_PASSWORD2_LABEL"
         size="30"
         validate="password"
         required="true"
      />
      <field name="email1" type="email"
         description="COM_USERS_REGISTER_EMAIL1_DESC"
         field="id"
         filter="string"
         label="COM_USERS_REGISTER_EMAIL1_LABEL"
         message="COM_USERS_REGISTER_EMAIL1_MESSAGE"
         required="true"
         size="30"
         unique="true"
         validate="email"
      />
      <field name="email2" 
      type="email"
      description="COM_USERS_REGISTER_EMAIL2_DESC"
         field="email1"
         filter="string"
         label="COM_USERS_REGISTER_EMAIL2_LABEL"
         message="COM_USERS_REGISTER_EMAIL2_MESSAGE"
         required="true"
         size="30"
         validate="equals"
               />
      <field
         name="captcha"
         type="captcha"
         label="COM_USERS_CAPTCHA_LABEL"
         description="COM_USERS_CAPTCHA_DESC"
         validate="captcha"
      />
   </fieldset>
</form>
А здесь на форуме мне подсказали вставить код: 
https://jsfiddle.net/1p1zjojg/3/ И еще одну ссылку давали: 
https://docs.joomla.org/Checkboxes_form_field_typeА вот куда это вставить в код, и чтобы все заработали понятия не имею((((