killswitch predator

So after about 2 years of not starting, my preadator 212 ran into another issue, the kill switch doesn’t work, not even the stock on on the engine. My question here is how do i fix this, i am not good with wiring nor do i know how to identify the issue. Any held would be great!

I've got this killswitch https://www.OldMiniBikes.com/Kill-Button-Switch.html?category_id=15#product-details-tab-description Do I just attach the metal part to the bolt that the "OFF" wire runs to and that's it? I don't want to mess up the "ON" "OFF" switch already on the engine.