Wix Website - Add a required Checkbox when customers use the PayPal button

I have done research. It can be done. I even have a URL that contains code that might work. I just don't know how to code and don't want to screw up my site.

See this link
https://articlebin.michaelmilette.com/add-terms-and-conditions-checkbox-to-paypal-button/?unapproved=23000&moderation-hash=6faca39c7e5e9f5243f10471cffb8f9d#comment-23000