First: What is pinterest?
Pinterest is described on its website as a “virtual pinboard” – a place for you to “collect the things you love”. Other useful descriptions you’ll hear are “online vision boards” and “image bookmarking website”.
How to Add Pinterest Button to Your Ning
Probably best to add it to the right column (which shows up on all pages)
Go to the Pinterest Goodies Page and look for this:
Fill out the relevant fields as shown above and take the generated code and add it to a text box in your site.