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HOW do I sign in with my current screen name!

I lost all my saved passwords after a malwarebytes and ccleaner binge yesterday. Now I can't get into gardenweb without my OLD username and password. The sign in page comes up with that combo. Why is it like that? Why isn't my sign in page with my current user name? I was not able to change it and went round and round at the houzz site and had to go to my email trash to get to gardenweb forums. What a pain!