Go to your user name in the upper right (next to 'inbox' and 'alerts'), and click on your user name.
Scroll down and on the left hand side, under 'Settings' click on 'Contact Details'. That will show the email address that you are registered under.
If you go to that email address you should have an email from patsfans.com with a code that will allow you to update your password. If you don't see it, check your spam folder ("junk folder"), it may have ended up there rather than in your inbox/messages received.
Hope that helps.