How do I change my forum username?

[solaris]

Or, if this is not possible, how do I delete/unregister from the forum?

[selden]

Only an Admin can delete userids. (Not me.)

You can delete all of the information related to your userid (pm, email, etc) and then create a new userid, however.

[Paolo]

phpBB allows in its configuration to specify if users can change their name.
By default the flag is set to NO and can be changed only by admins.
There are several reasons for this.

[Rassilon]

Only an Admin can delete userids. (Not me.)

You can now