Good so far? Great. Now with a flathead screwdriver, or a good set of fingers. Pull the wiper off.
Remember to pair the distributor cap with the correct wiper. It may work if unpaired, but... that might not be intelligent.
Anyway. Now that its all disassembled as it needs to be (NEVER even go CLOSE to the bolts that hold the rotor in place. All the rotor is, is a bearing, a shaft, and a gear. that should never break.)
Your distributor rotor should look like this::
Check the O ring and replace if necessary.
Now, with regards to where the sharpie mark is, push the new contact wiper on your old distributor rotor.
and here comes the complex part. (well... semi complex)
Take the new distributor cap, and compare it to the removed one. Make sure all contacts are nice and clean, and then orient it properly.
Then, make sure the spark plug wires on the New distributor are oriented correctly. I recommend new wires here. Just do it.
and, with everything lined up, screw the new distributor cap in place.
If all goes well, your engine should fire right up, and you will be on your way.
Easier than changing the %$@#@(*! Air filter