How to Hide Instant Knowledgebase Admin Menus

function plt_hide_instant_knowledgebase_menus() {
	//Hide "Knowledge Base".
	remove_menu_page('edit.php?post_type=ikbase_article');
	//Hide "Knowledge Base → Knowledge Base".
	remove_submenu_page('edit.php?post_type=ikbase_article', 'edit.php?post_type=ikbase_article');
	//Hide "Knowledge Base → Add Post".
	remove_submenu_page('edit.php?post_type=ikbase_article', 'post-new.php?post_type=ikbase_article');
	//Hide "Knowledge Base → Categories".
	remove_submenu_page('edit.php?post_type=ikbase_article', 'edit-tags.php?taxonomy=ikbase_category&post_type=ikbase_article');
	//Hide "Knowledge Base → Tags".
	remove_submenu_page('edit.php?post_type=ikbase_article', 'edit-tags.php?taxonomy=ikbase_tags&post_type=ikbase_article');
	//Hide "Knowledge Base → Settings".
	remove_submenu_page('edit.php?post_type=ikbase_article', 'ikbinstantknowledgebase_settings');
}

add_action('admin_menu', 'plt_hide_instant_knowledgebase_menus', 11);

Where do I put this code?