How to Place a Pin It Button?

How to place a Pin It or Pinterest button on each photo? Until last week, I was jealous with that button on many blogs. While I was moving my mouse pointer over a picture, a small Pin It button was appearing on the upper left side. 
Hopefully I found the code or the widget for that small Pin It button. Here are the steps to place Pin It button on photos at your blog or website.
2. Click to “any image”
3. Click to “Build It”
4. Copy the code from the “Load the JavaScript” section
5. Paste the code above the