On the scope of this community:

If you already had a forum account on the previous site, simply go to https://forum.redump.info/, click “Login” and hit “I forgot my password” to create a new password. Of course, all new contributors are welcome and you can simply register a new account at the same site:

New Location: https://redump.info/
Getting Started: https://wiki.redump.info/Getting/_Started/_Guide
Forum: https://forum.redump.info/