Adding another 'mydomain' Email address to Windows Live mail

Hello,

When I opened a Hotmail account using my own domain (transenglish.net) I only created one email account. I now need to add 1 more address, but I can't get back to the screen that sets up e-mail addresses! (Someone told me I have to delete the entire account as you cam only set up multiple emails the first time)
Help appreciated

Dave