Start Button

I have installed a new NSS without any improvement.  If I put battery power to the purple wire which goes to the solenoid, then I can start.  I have researched everywhere for how to install a start button, BUT none of the articles say where to take 12v from INTO the button.  I need the NSS connected for back up lights; I just want to have a start button for the rest of the season and then work on the NSS hookup.  I have spent HOURS trying to align the NSS without any luck.  Also, I cannot find a way to tighten the rearmost (smal) bolt which secures the NSS.  I wonder how they did this garbage on the production line?