Paypall Button Issue - Form lines deleted after copying

I am using sitebuilder zen cart provided by siteground.com so it is most likely the latest version.

When I build a button in my cart and then copy the paypall button script over to my cart the forms (first three lines of the script) gets removed when I close the window. Thus the button does not work. I did a form search on the forum but that indicated no results. Any ideas that might help?

Thank you for your help.

Zen Cart is way more than merely a "paypal button shopping cart".

With Zen Cart, you enter your products in the database, and your customers can add those products to their shopping basket. Then they can choose to commence checkout at whatever point they decide they're done shopping. They enter their address info, choose shipping preferences, choose a payment method, and confirm their order.

If their payment choice is Paypal, Zen Cart will automatically take them to PayPal for payment at the appropriate time.

AT NO POINT do you ever need to put a "paypal button" on your pages. Those are for rudimentary simple websites that don't have a shopping cart system installed, such as Zen Cart. It's a completely different concept.