Hey i dont got pics but i can tell you.
1.Take forks out of clamps by unscrewing clamp screws.
2.Clamp fork in a vice(note: put a rag on the bit u are putting in the vice as it will mark if you dont).
3.Unscrew big screw on top of forks.( Hold your hand on top because sometimes it springs up.)
4. Take out fork spring. Or some forks the spring is attached the the screw and cannot be removed that easily but no big deal).
5. If your spring can come out easily or not use this method.
6. Tilt fork on side to a container and then pump the fork a until most or all oil is out.
7. Add fork oil( most pitbike forks take around 200mls or 250mls.
8. Put spring back in and tighten the top screw back into place.
9. Remove from vice
10. Place back into clamps and tighten clamps. ( you can adjust them higher or lower to suit your riding).
Thats the simplest way i can explain.