The setup:

• Either find an unused bookmark in Safari or create any bookmark that you will change.
• Edit the bookmark
• Name the bookmark something like “Pin to Pinterest”
• Delete the URL and replace with this text (hint:copy and paste this):

javascript:void((function(){var%20e=document.createElement(‘script’); e.setAttribute(‘type’,’text/javascript’); e.setAttribute(‘charset’,’UTF-8′); e.setAttribute(‘src’,’http://assets.pinterest.com/js/pinmarklet.js?r=’+Math.random()*99999999);document.body.appendChild(e)})());

• Save the bookmark (tap Done twice)

• Go to a web page where there is an image you want to pin.
• Open Bookmarks
• Tap the Pin to Pinterest bookmark you made previously
• Tap the image you want to pin
• Follow the process to pin it
• Use the bookmark any time you want to pin something on the page in Safari!