Tips on Customizing HTML5 Video Player – mp4 Video Player Plugin and Block

How to Hide Html5 Video Player Admin Menus

function plt_hide_html5_video_player_menus() {
	//Hide "Html5 Video Player".
	remove_menu_page('edit.php?post_type=videoplayer');
	//Hide "Html5 Video Player → Html5 Video Player".
	remove_submenu_page('edit.php?post_type=videoplayer', 'edit.php?post_type=videoplayer');
	//Hide "Html5 Video Player → Add New Player".
	remove_submenu_page('edit.php?post_type=videoplayer', 'post-new.php?post_type=videoplayer');
	//Hide "Html5 Video Player → Settings".
	remove_submenu_page('edit.php?post_type=videoplayer', 'html5vp_settings');
	//Hide "Html5 Video Player → Quick Player".
	remove_submenu_page('edit.php?post_type=videoplayer', 'html5vp_quick_player');
	//Hide "Html5 Video Player → Affiliation".
	remove_submenu_page('edit.php?post_type=videoplayer', 'html5-video-player-affiliation');
	//Hide "Html5 Video Player → Contact Us".
	remove_submenu_page('edit.php?post_type=videoplayer', 'html5-video-player-contact');
	//Hide "Html5 Video Player → Upgrade".
	remove_submenu_page('edit.php?post_type=videoplayer', 'html5-video-player-pricing');
}

add_action('admin_menu', 'plt_hide_html5_video_player_menus', 1000000000);

Where do I put this code?

How to Hide the "Configure Your Video Player" Meta Box

function plt_hide_html5_video_player_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Configure Your Video Player" meta box.
	remove_meta_box('_h5vp_', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_html5_video_player_metaboxes', 20);