How can I change my FictionPress username?

[Amazing Amy]

I would like to change my username for my FictionPress account, but I'm not sure how to do it. I have tried to search for answers on Google, but my search has proved fruitless. Please could someone help me?

[Question]

Go to your account - settings page (what you get to when you log in or you can click your username when you're on the FP homepage)
Under Account Settings there's a thing that says Pen Name with your pen name, and a link beside it that says Change. Click on it and follow the directions.

It's very clear once you get to account settings, but maybe you can't change it because the name's already taken?
Hope this helps, anyway.