http://iscoresports.com/

I have started helping a friend with scoring in a baseball league. Is there a way to unregister my device from my admin site, so that I can use it with his as though he has two devices? And when I am on my or his admin site, the page to register devices does not work. There are the three boxes for email, first, and last name. But they are filled in with my original info and cannot be changed.

You should only register your device to your own email. If you are trying to share data between devices, you can use Data Sharing without needing the devices to be registered together. Here is a link that describes how data sharing works:

http://iscoresports.com/baseball/kb/faq ... _share.php