From what I understand, if you have booked a guaranty cabin, you go to Carnival's web site and go to the gift section. In that section, they will ask for your booking number and cabin number. In the cabin number space, you just start entering cabin numbers, starting with the category you booked. If it's not your cabin number, then it will say "Invalid Booking and/or Cabin." If you do hit on your cabin, then it will say "You cannot purchase gifts for a guaranty. Please call Carnival." or something to that extent. I've tried it here and there and ended up getting bored. From what I've read on here, it does take some time. If you do try, good luck. I haven't found our cabin yet.