How to get out of this forum / delete acccount?

This thing ( sends me mails I do not want. It does not make it easy/obvious to stop all of them. So consequently I wanted to outright delete my account. That functionality cannot be discovered either.

What gives?!

For the e-mails, there has been a topic about, not sure if you have seen it and if it helped you:

We can anonymize your account if your wish (Delete my User Account from

Please anonymize my account…