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You can use

apply_filters('show_password_fields', true) )
add_filter('show_password_fields','youfunction',10,1);
function youfunction($return)
{
    ?>
    <tr>
                    <th><label for="gender">Gender</label></th>
                    <td>
                        
                        <label><input type="radio" name="w4p_user_gender"  value="male" class="regular-radio"  />Male</label>
                        <label style="margin-left:10px"><input type="radio" name="w4p_user_gender"  value="female" class="regular-radio"  />Female</label><br/>
                        <span class="description">Please select your Gender.</span>
                    </td>
                </tr>
    <?php
    return $return;
}

this filter to add your fields. I don't know it's is a good idea or not but works for me :).