How do I get a facebook username for my band page?

[Vanishing]

I know that a while ago facebook launched its username feature where people can create a username so that the url for there page comes up as http://www.facebook.com/insertusernamehere

but it was my understanding that this feature also came out for public profiles (or "pages")

I have a page used for marketing my band that I would like to get a username for but everytime I go to the username link http://www.facebook.com/username

it just says that I already have a user name for my profile (which I do), so how am I supposed to be able to get one for my band page?

Thanks alot in advance, I can't find anything on google about this