How to Hide the "xBrander" Admin Menu

function plt_hide_xbrander_pdf_document_brander_menus() {
	//Hide the "xBrander" menu.
	remove_menu_page('xbrander');
}

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

Where do I put this code?