A&B Kinetix 5700 changing home position

Does anyone know these drives that can help? I need to move a home position on a drive by -500mm. I've physically got the carrier in position, but now I want to 'zero' off the -500mm, and I can't seem to find where to do it currently.
Or can I just add a home offset in instead?

Perhaps this old post will help you not the same model but may give you some ideas

http://www.plctalk.net/qanda/showthread.php?t=86219

Looks like you were right there. It's also in the 'Homing' section