[quote=Card]
Doing some fiddling; where would I find a username? All I can find is my actual name and the email I've given it.
[/quote]

the email should work too from memory.

But if you click on your screen name up in the top left below the Skype and Contact buttons on the top of the screen you should end up on a screen with your profile.

It'll have an Accounts field there with your username :)