One of the easiest and most important things any website can do to help people to discover their stuff on Pinterest is to install the Pin It button. The Pin It button makes it super simple for people to save and share things they find on your site. These Pins link back to your website and increase the spread of your content across Pinterest.
Paste below pin code your blogger blog following instruction
1. Go blogger sing in
2. Click to template
3. Search below tag find on HTML Editor (ctrl+F) or manually
-Click to Enlarge Image-
4. You want to add script code in <footer> cord in to following example.
-Click to Enlarge this Image-
7. Save and Save arrangement
OK that is best pin it button add on your web site and can pin pinterest.comThanks.