To rename a SmartPop account follow these steps:
Stop the account you wish to rename, by clicking the 'Stop' button next to it.
Click the 'Rename this SmartPop' button for that account.
Enter the new name for this account in the field in the Dialogue that appears.
Press OK. The new name will replace the one in the list.
Restart the account, by pressing the 'Start' button
The account is now renamed and running again, it will connect as usual.