Hey @David Hoare below the picture at the top of the homepage your username will be displayed on the right hand side, click on it and that enables you to edit your profile sittings via the pop up box.
Dave
I don't think you can change the name yourself. If you want to do that you will have to get admin to make the change for you. I am sure @expanda will be able to help you out. Drop him a pm (personal message) and let him know the changes you would like.