Please make sure you are logged in. At the top menu bar, you should see a section labeled “User”. If you see “Login/Register” here you are not logged in.
Activate your account. If you have recently registered your account, you may first have to activate it. You will receive an e-mail with an activation link.
Make sure to check your spam folder!
Be patient. Galaxy is a free service, when a lot of people are using it, you may have to wait longer than usual (especially for ‘big’ jobs, e.g. alignments).
Contact Support. If you really think something is wrong with the server, you can ask for support