I just changed the oil on my friends 08 honda forman 500 EPS. I want to reset the oil change light that blinks when you turn it on. Anyone know how to do this?

On the Rincon there are two large buttons that you push at the same time and hold until the light goes off.
Not familiar with the Foreman but I would bet it is a similar arrangement, look for two of the buttons that switch between hour and miles and or trip set type of thing push and hold them and see if the oil reminder resets.

Have you looked in the owners manual??