I can login with my other email, but following private forum link from Jocelyn's email to the email that I registered under returns message that private forum does not exist. Any help much appreciated. I've tried all obvious solutions.
You need to be using a permies.com account that is registered to the same email that you used for the kickstarter (I'm assuming you were kickstarter supporter?)
Let us know if you have a problem changing your registered email address.
Just want to add that if you already tried to change your email address and it didn't work, try it again now and I think you'll find it works this time.