How do I make a select button for MVS?

It´s pinout number 26 in JAMMA connector, where I should put this game select button, but how to do that?
Thanks

What do you have? Cab, supergun? What type of controllers?

It's easy: you take a button, it has two places to attach wires to. You attach one of them to pin 26, and the other one to any ground spot. That's all.
Notice that you can do the same with the second player.

if you are using a board with a built on controll port, then either wire a button to pin #3... or use the select button on a nintendo controller.....

If not:

If the jamma connector is solder type, then you just loder a button between that pin and the ground...

If it' doesn't have pins on all the connectors, happs has crimp type controlls that you can insert.....

Thanks again, guys