How can I log in to the Unity forums?

I typed in my username and password and it says that I’m not a member. I know my username and password, and anyone can tell that because I’m logged in. Can someone help?

Unity Answers and the Unity Forum use the same login system, so, if you can post here, you should be able to post there. Note that I cannot see an account on the forum registered to your name or email address. Have you ever posted there?