Problem changing my user name?

[Cap'n Custud]

How come the site won't let me do it. It keeps saying there is something wrong.

[Mr Will]

That will be caused by the apostrophe in your username. What name would you like to change to?

[Cap'n Custud]

Mr Will

I meant to reply ages ago, sorry! I will PM you my new name and the reson why.

[Mr Will]

All sorted!