2 extra emails .Mac can I change the name?

[Giacomo]

I paid 2 extra emails for a full year can I change the name?

also I have my main .Mac has my name... I will like to transfer to a different name it is possible?
for example right now all the webpages are:

homepage.mac.com/myname/.....

I want

homepage.mac.com/NEWNAME/

and the new name is in my email alias....

thanks