Can I add a quantity to my products?

I have the multiple products listed with the payment option but right now people can only check off one of each. Is there a way to make a quantity so they can order the same product more then quantity one?

To do that I would suggest checking out this guide: How to add options to Payment Forms

It will show you how you can achieve this, but if you happen to have any questions along the way or issues setting it up just as you wanted, do let us know and we would be happy to assist.