Can't change my display name in Outlook 2010

I'm trying to change my display name (recently married) in Outlook 2010. I looked up how to do it, and it seems easy enough, but when I get to Account Settings and click on "Change", the only thing that shows up is my server info. There's no User Information, name, etc for me to change. I'm not sure if there's a problem with administrator rights or why I can't edit it? When I go into Outlook Express to try to change it there, I can get to the Edit window, but it won't allow me to actually type/edit the information.