YOu can not change the name that you set up the MoMe account with. That is the bad news.
The Good news is that you can create an Alias within that account. (ie. Account was set up as
Me@me.com. Alias can be set up as
Me2@me.com) When an email is sent, you can choose for it to be sent from either email address. (Me@me.com or
Me2@me.com) All incoming emails will come to the same MoMe account.
You can find Aliases in MoMe in Mail=>Settings=>Preferences=>Aliases.
Just remember it is not a separate account like Gmail it is just an Alias coming to that account.