It depends on what exactly you want to do.
If you want the edge of your spoilboard to be Machine Zero, then you'd enter that number in the Home Offset in Config > Homing/Limits.
Then, if you want to move to Y0 after homing, then just use this in your home script.
DoButton(23)
Code "G53 G0 Y0"
While IsMoving()
Wend