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Remove the top...

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...and the shielding

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The chip marked '3193A' is the lockout chip, and we want to concentrate on pin 4

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Select an appropriate location for a switch (if you're going to install one)

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Create a pilot hole with a sharp knife, or the drill bit can walk all over & scratch up the back.

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Test fit the switch

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Pleanty of clearance for wiring

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Desolder pin 4 and bend it up. An alternative strategy is to cut the pin close to the board and bend it up. If you just want to disable the lockout, either let it float or tie it to ground, then reassemble.

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Solder the center switch terminal to pin 4, and the other two wires to ground and +5. They're both conveniently available right next to the chip.

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Tuck everything back in...

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...and put it back together.

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If you've ever put in a game that looked fine but kept resetting itself anyway, that will no longer happen! Woo! 4 less pins to keep clean! A switch isn't necessary, but I like them.