This is basically to help others avoid the same mistake I made....
During my Gamsat registration I did not yet have a UCAS id, and just now I read on their website that if you did not submit your ID during registration you should email it to them later... Good thing I read that today and checked whether they had my ID number!!!
They didn't, so I just sent it to them...
If in doubt, check the email you got when you registered (probably titled "GAMSAT UK Online Registration") and if your ucas id is empty, email it to them with your gamsat id and other things you may find relevant. I emailed it to
gamsatuk@acer.edu.au
Hope this helps people! And otherwise I'm glad people didn't make the same mistake I did!!!!
seriously slapping myself on the head...