How to Hide PopupKit Admin Menus

function plt_hide_popup_builder_block_menus() {
	//Hide "PopupKit".
	remove_menu_page('popupkit');
	//Hide "PopupKit → Campaigns".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=campaigns');
	//Hide "PopupKit → Subscribers".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=subscribers');
	//Hide "PopupKit → Analytics".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=analytics');
	//Hide "PopupKit → Integrations".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=integrations');
	//Hide "PopupKit → Templates".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=templates');
	//Hide "PopupKit → A/B Testing".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=ab-testing');
	//Hide "PopupKit → Settings".
	remove_submenu_page('popupkit', 'http://127.0.0.1/wp-admin/admin.php?page=popupkit&subpage=settings');
	//Hide "PopupKit → Our Plugins".
	remove_submenu_page('popupkit', 'popup-builder-block_wpmet_plugins');
}

add_action('admin_menu', 'plt_hide_popup_builder_block_menus', 100000);

Where do I put this code?