OK, tried that twice. Using the email address registered with Interact Forum. Both times said "You will receive an email with instructions about how to reset your password in a few minutes." I never got emails.
So then I tried "Didn't receive confirmation instructions?"
That brought up the 'Resend confirmation instructions' box. Entered email and sent. New box with this message appeared; "Email was already confirmed, please try signing in".
As instructed I tried that and got this error message, "Invalid username or password."
So tried using Sign Up again. One attempt using the same 'registration' password I had been using all along. One attempt using the password I use for Interact Forum. Same error with both, "Email has already been taken"
For the heck of it I tried the "Didn't receive unlock instructions?" option. Got message "Email was not locked"