I have account using google openid on stackoverflow, meta and superuser.
It happens that, for some reason I don't know/don't recall, my superuser account username is quite ridiculous: something similar to user13412
And I would like to change that. I would like to be nunos on all three sites.
My question is, how can I clear the association or possibly the userxxxxx account. I really don't mind loosing the reputation on superuser since it's not that much.