Fullmetal, registration is closed right now because there is a Great War currently. Once it dies down, reg should open up again. As for public computers...I wouldn't recommend it. But if you must, you should, once you can, create a nation and then PM a moderator asking for an I.P. check to see if you are sharing the I.P. with another nation. If you are, then sorry, you are out of luck. Try another computer, maybe? You are truly out of luck if all the computers are using the same I.P. to connect to the internet.
This is Great War IV, and it is dying down now.