Alright, I just got done doing this simple modification for the first time. Anyone should be able to do this if they have access to tape, and a screwdriver.
First, flip over your Saturn console, and remove all screws. There are no hidden screws on this system (not on mine, shouldnt be on any). There should be around 5 screws total.
Once all screws are out, remove the top cover.
Now, notice where the eject sensor is located.
Next, tape the two together (test the system while holding the sensor if you are unsure how to tape)
Test your system with a game. If all is well, then your disk should spin up and play!
Put the system together, and play as you need!
If you have any questions, post here!