Add a Pinterest 'pin it' or 'save' button to Your Website
While you can verify your site with a Pinterest business account, adding a 'pin it' or 'save' button to your site is done by the site viewer on the browser level. The Pinterest browser button makes it easy to save creative ideas from around the web. All that is needed is to add the Pinterest browser button to your favorite browser, and you're ready to go.
To add the button to your browser, follow these instructions from the Pinterest blog.