I'm sorry that our new interface has confused you, but rest assured, Buzzword is still there, and it's still free. For quite awhile now, it's been part of Acrobat.com.
If you are seeing a screen that says "Sign in [Select]", simply select Acrobat.com from the list.
After you sign in, you should see all of your documents.
If you are seeing a screen that says "Create account | Sign in", then simply click Sign in and proceed from there.
If all else fails, try going to https://acrobat.com/SignIn.html. Then sign in there.
Hope this helps.