What were you doing before that "didn't work"?
A couple other thoughts that might help you when entering flight plans and using RealPlan:
- As long as you have at least two points in your FP (a start point and a destination), then the option for RealPlan will show up under "More Options".
- You can type all the waypoints in at once without clicking "Done" in-between. So: Menu > Flight Plan > (Clear, if necessary) > Enter Flight Plan > (start typing:) Kxxx wpt1 wpt2 Kxxx > Done. (This also works with only two points, an origin airport and a destination airport.)