How to Hide Opiner Me Admin Menus

function plt_hide_opiner_me_menus() {
	//Hide "Settings → Opiner Me Logs".
	remove_submenu_page('options-general.php', 'opiner-me-log-viewer');

	//Hide "Opiner Me".
	remove_menu_page('opiner-me');
	//Hide "Opiner Me → Main Page".
	remove_submenu_page('opiner-me', 'opiner-me');
	//Hide "Opiner Me → Settings".
	remove_submenu_page('opiner-me', 'opiner-me-settings');
	//Hide "Opiner Me → Moderation".
	remove_submenu_page('opiner-me', 'opiner-me-moderation');
	//Hide "Opiner Me → License PRO".
	remove_submenu_page('opiner-me', 'opiner-me-license');
}

add_action('admin_menu', 'plt_hide_opiner_me_menus', 11);
Where do I put this code?