Hello @DeborahF282 ,
If you're able to log into the account, you can change the username, main email address, and other details from within the account. If you don't have the account's login credentials, but you do have access to the account's main email address, you can recover the username and reset the password to login.
If you don't have access to the account's login credentials, nor access to the account's main email address, you'll want to call in and request an account ownership transfer through our phone support. Phone support may need to confirm some account details and security aspects, if the system doesn't recognize the information your provide to find the account.