MemberPress: Add Tag Support for Lessons and Quizzes

function mepr_add_tags_to_lessons(){

    register_taxonomy_for_object_type( 'post_tag', 'mpcs-lesson' );

}

add_action( 'init', 'mepr_add_tags_to_lessons' );

function mepr_add_tags_to_quiz () {

    register_taxonomy_for_object_type( 'post_tag', 'mpcs-quiz' );

}

add_action ( 'init', 'mepr_add_tags_to_quiz' );