How to Hide Ultimate WordPress Auction Plugin Admin Menus

function plt_hide_ultimate_auction_menus() {
	//Hide "Ultimate Auction".
	remove_menu_page('ultimate-auction');
	//Hide "Ultimate Auction → Settings".
	remove_submenu_page('ultimate-auction', 'ultimate-auction');
	//Hide "Ultimate Auction → Payment".
	remove_submenu_page('ultimate-auction', 'payment');
	//Hide "Ultimate Auction → Add Auction".
	remove_submenu_page('ultimate-auction', 'add-new-auction');
	//Hide "Ultimate Auction → Manage Auctions".
	remove_submenu_page('ultimate-auction', 'manage_auctions');
	//Hide "Ultimate Auction → PRO Features".
	remove_submenu_page('ultimate-auction', 'wdm_why_pro');
}

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

Where do I put this code?