I been playing around with Erics A320 panel. I don't know how to get the plane to follow the flight plan in the gps. I don't even see any buttons that say NAV/GPS. Any help??

Read the manual on his website. It doesn't use the normal style of flight plan following, it uses it's own FMGC. It took me a few days to get fully sussed with it. I advise printing out his 'Typical Flight' and use it as reference.Good luck.