Samurai bro, the problem is that when you're registering don't just hit tab or click on the next line, hit enter. That fixed everything for the registering part. When you login, the username will turn green at the bottom and you'll know that its working. If you connect to games and you either keep on getting disconnected or no servers show up, if you have anti-virus software, that could be problem, make sure GRAW is in its exception lists for internet access, and make sure that the following ports are open.
Hope this helps bro. P.S. If it still doesn't work, I recommend a reboot, thats what helped my internet work for GRAW, and make sure 2 defrag after installing the game, helps performance as well.