UserMetaPro

add_filter( 'user_meta_field_config', 'editOnlyBlank', 10, 2 );
function editOnlyBlank( $field, $fieldID ) {
    global $userMeta;
    
    // Change Target_Field_ID
    if ( $fieldID <> 'Target_Field_ID' ) return $field;

    // Uncomments this line if an admin are allowed to edit value
    // if ( $userMeta->isAdmin() ) return $field;
        

UserMetaPro

add_filter( 'user_meta_field_config', 'user_meta_field_config_populate_categories', 10, 3 );
function user_meta_field_config_populate_categories( $field, $fieldID, $formName ){ 

    if( $fieldID != 'Your_Field_ID' ) // Put your desired field id here
        return $field;
    
    $output = null;
    $cats = get_categories();
    foreach( $cats as $cat ):
        $output .= $cat->term_id.'='.$cat->name.',';

UserMetaPro

add_filter( 'user_meta_field_config', 'user_meta_field_config_add_asterisk', 10, 3 );
function user_meta_field_config_add_asterisk( $field, $fieldID, $formName ){     
    if( !empty($field['required']) || in_array($field['field_type'], array('user_login', 'user_email')) ){
        if( !empty( $field['field_title'] ) )
            $field['field_title'] .= '<span class="um_required">*</span>';
    }
    
    return $field;
}

UserMetaPro

add_filter( 'user_meta_field_config', 'user_meta_field_config_add_asterisk', 10, 3 );
function user_meta_field_config_add_asterisk( $field, $fieldID, $formName ){     
    if( !empty($field['required']) || in_array($field['field_type'], array('user_login', 'user_email')) ){
        if( !empty( $field['field_title'] ) )
            $field['field_title'] .= '<span class="um_required">*</span>';
    }
    
    return $field;
}

UserMetaPro

add_filter( 'user_meta_field_config', 'titleAsPlaceholder', 10, 3 );
function titleAsPlaceholder( $field, $fieldID, $formName ) {
    if ( !empty( $field['field_title'] ) )
        $field['placeholder'] = $field['field_title'];
 
    return $field;
}

UserMetaPro

add_filter( 'user_meta_default_login_form', 'user_meta_default_login_form_function' );
function user_meta_default_login_form_function( $config ){
    $config['login_label']  = "Your desire text for login input";
    $config['pass_label']   = "Your desire text for password input";
    $config['remember_label'] = "Your desire text for rember me checkbox";
    $config['button_value'] = "Your desire text for login button";
 
    return $config;
}

UserMetaPro

add_action( 'user_meta_after_user_update', 'user_meta_after_user_update_function' );
function user_meta_after_user_update_function( $response ){
    global $userMeta;
    echo $userMeta->jsRedirect( 'http://example.com' );
}

UserMetaPro

add_filter( 'user_meta_field_config', 'user_meta_field_config_function', 10, 3 );
function user_meta_field_config_function( $field, $fieldID, $formName ){ 
    if( $fieldID != 0 ) // Replace 0 with your filed id
        return $field;
    $field['field_options'] = array( "yearRange"=>"1900:c" );
    return $field;
}

UserMetaPro

add_filter( 'user_meta_field_config', 'commonCssClassToAllFields', 10, 3 );
function commonCssClassToAllFields( $field, $fieldID, $formName ){     
    $field['field_class'] = 'my-common-class ';
    
    return $field;
}

UserMetaPro

   function generateWpmlConfig() {
        global $userMeta;
        
        if ( ! $userMeta->isAdmin() ) return;
        
        if ( ! is_writable( $userMeta->pluginPath ) ) return;
        
        $writer = new XMLWriter();  
        $writer->openURI( $userMeta->pluginPath . '/wpml-config.xml');   
        $writer->setIndent(4);