openscholar remove delete user

Newbie into OpenScholar admin... I add a username in via /site/register
As site administrator i decide to remove that user, which I do via /admin/user/user/list
and then also remove his path via /admin/build/path/list

But the system still shows that user as a Featured user (!) and denies him when he tries to recreate with the message that his domain name is already taken.

Where/how do i really delete a user?

TIA,
-Ben