So, I bought TD2 on Steam after getting in game, the window isn't full screen, and I'm unsure how to make it fullscreen, I'm not sure if this is how you play TDU2 or something, but, the next problem. When I try to log in, it says I have to create an Atari.com profile, I enter in my nickname (Darkshifter98) and the profile name (Darkshifter98 (lol)) and then I enter the password that I use for Atari.com and it says that the atari profile doesn't excist.
So, what do I do?