Let a user edit his existing WordPress Profile directly from the FrontEnd through a CPT Edit/Create CRED form.

Note that this function assumes a setup with the correct CPT’s, custom fields, user CF’s.

The Process of this example CRED Form will create a CPT “user Profile” entry , which can be used for front-end displaying user profiles (with a content template as example).
During this, it will get the CPT field values and update the USER fields with it.

This example is also useful to see how checkboxes (multi-options) are different then “normal” CF’s.

function user_save_data_action($post_id, $form_data) {
       
        if ($form_data['id']==ID) {
           
            //get curretn user's ID
            $user_id = get_current_user_id();
 
            //get Skype post_meta field value he submits in post
            //note: any other SINGLE option Field applies to below "rule")
            $skype = get_post_meta( $post_id, 'wpcf-skype', true );
            //update the user_meta field with this value
            update_user_meta($user_id, 'wpcf-skype', $skype);
 
            //repeats as above
            //again, ANY single value Field can be used (email, URL, etc)
            $phone = get_post_meta( $post_id, 'wpcf-phone-number', true );
            update_user_meta($user_id, 'wpcf-phone', $phone);
            $pic = get_post_meta( $post_id, 'wpcf-profile-photo', true );
            update_user_meta($user_id, 'wpcf-profile-image', $pic);
           
            //now the tricky part, we are handling with CheckBoxes, multiple Options!
            //AGAIN, THANK YOU +Ana Couto !!!!
 
            //Check if actually the post_meta Checkboxes field has value(s)
            if ( isset($_POST['wpcf-languages'])){
                //if yes, get all the user meta fields and custom fields information (of user + post)
                $langs_user = get_option( 'wpcf-usermeta' );//users fields
                $langs_fields = get_option( 'wpcf-fields' );//posts fields
                //refine this, we only want specific fields, actually the "languages" and "support-languages" fields
                //being those the checkboxes fields (with options), once for user, once for post
                $langs_user_options = $langs_user['support-languages']['data']['options'];//user field
                $langs_fields_options = $langs_fields['languages']['data']['options'];//post field
 
                //check the field's values against each other (user_meta vs post_meta field values)
                $langs_selected = $_POST['wpcf-languages'];//get values from post field (all of them)
 
                //define the data with which we are going to update user_meta field
                $user_langs = array();
                    foreach ($langs_selected as $fields_option_key) {
                        if (isset($langs_fields_options[$fields_option_key])) {
                            $value = $langs_fields_options[$fields_option_key]['set_value'];
                            foreach ($langs_user_options as $user_option_key => $user_option) {
                                if ($user_option['set_value'] == $value) {
                                    $user_langs[$user_option_key] = array($value);
                                    break;
                                }
                            }
                        }
                    }
 
                //update the user_meta field
                update_user_meta($user_id, 'wpcf-support-languages', $user_langs);
            }
           
             //Now it get's easy again :)
            //Update post_name (slug) with user_name (author)
            //we don't want author to enter a title for his profile, this should be done automatically
            $custom_title = wp_get_current_user();//get user, define where to get info from for new title
            $new_title = $custom_title->user_login;//get login name from user
 
            //collect data and define new title
            $my_post = array(
                        'ID'            => $post_id,
                        'post_name'     => $new_title,
                        'post_title'    => $new_title,//we NEED to do that, otherwise, AUTO DRAFT will be post name
 
            );
 
            // Update the post into the database
            wp_update_post( $my_post );
 
        }
    }
add_action('cred_save_data', 'user_save_data_action',10,2);