Tips on Customizing Simple CallToAction PopUp

How to Hide Simple CallToAction PopUp Admin Menus

function plt_hide_simple_calltoaction_popup_menus() {
	//Hide "Simple Call-To-Action Popup".
	remove_menu_page('simple-calltoaction-popup');
	//Hide "Simple Call-To-Action Popup → General".
	remove_submenu_page('simple-calltoaction-popup', 'simple-calltoaction-popup');
	//Hide "Simple Call-To-Action Popup → All Popup".
	remove_submenu_page('simple-calltoaction-popup', 'edit.php?post_type=simple_action_popup');
	//Hide "Simple Call-To-Action Popup → Add New".
	remove_submenu_page('simple-calltoaction-popup', 'post-new.php?post_type=simple_action_popup');
}

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

Where do I put this code?

How to Hide Simple CallToAction PopUp Meta Boxes

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

	//Hide the "Publish" meta box.
	remove_meta_box('submitdiv_boxes', $screen->id, 'side');
	//Hide the "Copy this shortcode" meta box.
	remove_meta_box('view_shortcode', $screen->id, 'side');
	//Hide the "Main Settings for Popup" meta box.
	remove_meta_box('main_boxes', $screen->id, 'normal');
}

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