How to delete forum account, or change username?

I wanted to change my username on this Forum (http://forum.openstreetmap.org/).

Since I can’t, I want to delete my account (I definitely no longer want to have that username I have now public).

I also do not find in my profile settings an option to delete my account.

So:

  • How can I delete my account? Can an admin do that for me?
  • Or can an admin change my username? (Please contact me via private message to ask for the new user name).

Regards!