When you get to that screen where it tells you to enter your username, are you entering it? Are you entering your login password? If not, then you need to. Get your login password by selecting PC off of the connection menu.
If you have been doing these things and when you press the login button, it's still not loading, you may want to check to make sure your username is right, and your password is right.
If they are, then just keep pressing login because this has happened to me. Sometimes when I press it it won't log me in the first time. Try it some more times.
If it still doesn't work, X-out of the TamaTown screen and try again, or turn off your computer and turn it back on and go back online.
If it STILL doesn't work, just wait a while and try again, because I wouldn't know what's wrong. Maybe it's a problem in your computer, but I doubt it. I'm sure you'll get it eventually.
GotchiGirl96