username@zoho.com address change?

username@zoho.com address change?

Hello,
I'm a total newbie (about 30 minutes old!) and I set up a simple account to begin playing around with Zoho to see if the apps/integration are what I'm looking for.  However, I would like to change the user name that I chose. Is there a way to do that without closing the account and starting up a new one?
THanks,
Pam