How to Hide the "Obituary Assistant" Admin Menu

function plt_hide_obituary_assistant_by_funeral_home_website_solutions_menus() {
	//Hide the "Obituary Assistant" menu.
	remove_menu_page('fhw-solutions-obituaries');
}

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

Where do I put this code?