skywalker......
if you are adding a rating, you need to register. however, you only need to do this once and then you're on their books.
it really is no big deal.....apart from the 100 dollars or so which you pay online.
when i registered, i waited until i got to the US to get printed. but i did pay my fee in advance. the TSA communicate with you regularly by email during the process.
i was taken by my instructor to the local police station where a gorgeous policewoman took my prints......so gorgeous in fact that i was even thinking about trying to get arrested so that she could take them again! (women in uniform with guns........ooooooh matron!)
you have to pay 10 dollars at the station to have your prints taken by the way........but it's a great experience....just like getting 'booked'