Transferring a domain to a different user's account in ZPanel is very simple. To perform the transfer, you'll first need to log in to your ZPanel admin area. Once logged in, select the Transfer Domain option, which should be located under the Domain Management section.
This interface will allow you to transfer a domain on your server to another user's account. Once the transfer is complete, the domain will now be associated with the new user that the domain was transferred to.