Nothing is simple with TG... TG uses Amadeus as its Res system, but is hosted in a quite outdated mainframe named 'Royal'. IIRC you need to know your Royal PNR number to be able to retrieve a reservation on TG site. To get this number go to
www.checkmytrip.com and enter Amadeus number (the one you have received from ANA). Your Royal PNR number will be there - listed as airline reservation number (next to each segment). You will now be able to retrieve your reservation via TG site (or order your F-class meal, if applicable).