How to Hide ELEX Embed YouTube Video Gallery Admin Menus

function plt_hide_elex_embed_youtube_video_gallery_menus() {
	//Hide the "YouTube Gallery" menu.
	remove_menu_page('ehyt_settings');
	//Hide the "YouTube Gallery → Gallery & Settings" menu.
	remove_submenu_page('ehyt_settings', 'ehyt_settings');
	//Hide the "YouTube Gallery → Go Premium!" menu.
	remove_submenu_page('ehyt_settings', 'go-premium');
}

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

Where do I put this code?