Create a product and save it from Products > Create Product
Navigate to your site from Sites > click your site. Select the page you'd like to add the product to from Manages Pages in to the top right.
Select Add Block in your desired area of the page > type in Pricing to the block search field > Select your desired block style. If you already have a pricing block, click Edit Block when you hover over this block.
In the right side bar, click Content > Scroll to the bottom and edit (pencil icon next to the trash can icon) a product you'd like to swap in with a new Zipper Product, or click +Add Product to add a new one.
Toggle Use product created in Zipper > select the desired product. Save and Publish your site from the top right hand corner.
Make sure the Button is leading to the desired action of your user, whether it be allowing them to purchase the product outright, or leading them to another page, like a contact us.
Now any edits you made in their product's pricing or description will automatically be reflected on your site.