You can change your Account name & Online store link with Yapsody displayed to the customer's.
Kindly follow the below mentioned steps to edit Account Name and sub-domain.
1) Go to Settings
2) You will see all the Account Settings displayed on the left side. "Account" tab will be selected by default. You will the "Account name" & Sub-domain on the right hand side. Click on the Box and mention the new Account Name. Click on "Save" button at the bottom.
3) You will see the option for Sub domain just below the Account Name. Click on the "Change" button. Mention the new Sub domain. Click on "Save" button at the bottom.