How to Hide Email List Builder by Social Intents Admin Menus

function plt_hide_email_list_builder_by_social_intents_menus() {
	//Hide the "Settings → List Builder Settings" menu.
	remove_submenu_page('options-general.php', 'email-list-builder-by-socialintents');
	//Hide the "List Builder" menu.
	remove_menu_page('si_dashboard');
}

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

Where do I put this code?