Rarely it may be necessary to change or update the Store Owner information of a FlavorCloud Account.
If you are able to log in as the Store Owner, you can update the login information under User Settings.

There you can update the email address and phone number of the Store Owner account. More information on updating User Settings can be found here.
If you are unable to log in as the Store Owner, then you will need to contact support at support@flavorcloud.com.