Wordpress - How To Add Custom Form Fields To The User Profile Page?

You need to use the 'show_user_profile', 'edit_user_profile', 'personal_options_update' and 'edit_user_profile_update' hooks.

Here's some code to add a Phone number:

add_action( 'show_user_profile', 'yoursite_extra_user_profile_fields' );
add_action( 'edit_user_profile', 'yoursite_extra_user_profile_fields' );
function yoursite_extra_user_profile_fields( $user ) {
?>
  <h3><?php _e("Extra profile information", "blank"); ?></h3>
  <table class="form-table">
    <tr>
      <th><label for="phone"><?php _e("Phone"); ?></label></th>
      <td>
        <input type="text" name="phone" id="phone" class="regular-text" 
            value="<?php echo esc_attr( get_the_author_meta( 'phone', $user->ID ) ); ?>" /><br />
        <span class="description"><?php _e("Please enter your phone."); ?></span>
    </td>
    </tr>
  </table>
<?php
}

add_action( 'personal_options_update', 'yoursite_save_extra_user_profile_fields' );
add_action( 'edit_user_profile_update', 'yoursite_save_extra_user_profile_fields' );
function yoursite_save_extra_user_profile_fields( $user_id ) {
  $saved = false;
  if ( current_user_can( 'edit_user', $user_id ) ) {
    update_user_meta( $user_id, 'phone', $_POST['phone'] );
    $saved = true;
  }
  return true;
}

That code will add a field to your user screen that looks something like this:

There are also several blog posts available on the subject that might be helpful:

• Adding and using custom user profile fields
• Adding Extra Fields to the WordPress User Profile

Or if you prefer not to roll-your-own there are plugins that add said features such as the following (although I'm sure there are others):

• Cimy User Extra Fields

// remove aim, jabber, yim 
function hide_profile_fields( $contactmethods ) {
    unset($contactmethods['aim']);
    unset($contactmethods['jabber']);
    unset($contactmethods['yim']);
    return $contactmethods;
}

// add anything else
function my_new_contactmethods( $contactmethods ) {
    //add Birthday
    $contactmethods['birthday'] = 'Birthday';
    //add Address
    $contactmethods['address'] = 'Address';
    //add City
    $contactmethods['city'] = 'City';
    //add State
    $contactmethods['state'] = 'State';
    //add Postcode
    $contactmethods['postcode'] = 'Postcode';
    //add Phone
    $contactmethods['phone'] = 'Phone';
    //add Mobilphone
    $contactmethods['mphone'] = 'Mobilphone';

    return $contactmethods;
}
add_filter('user_contactmethods','my_new_contactmethods',10,1);
add_filter('user_contactmethods','hide_profile_fields',10,1);

Hope this helps.

Source: WPBeginner