How to Hide WPRobo DocuMerge Lite Admin Menus

function plt_hide_wprobo_documerge_lite_menus() {
	//Hide "DocuMerge Lite".
	remove_menu_page('wprobo-documerge');
	//Hide "DocuMerge Lite → Dashboard".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge');
	//Hide "DocuMerge Lite → Templates".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge-templates');
	//Hide "DocuMerge Lite → Forms".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge-forms');
	//Hide "DocuMerge Lite → Submissions".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge-submissions');
	//Hide "DocuMerge Lite → Settings".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge-settings');
	//Hide "DocuMerge Lite → Help & Support".
	remove_submenu_page('wprobo-documerge', 'wprobo-documerge-help');
}

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

Where do I put this code?