Hi Kate, on Pinterest, you can add the affiliate URL when you create the new pin on your account. If you already have the pin made and want to add the affiliate link, you can just “edit” the pin and change the URL. Hope that makes sense. In the book, Elise has a step by step tutorial with photos on how to add the URL to Pinterest in case you need more help.
Affiliates may only post affiliate links on social media feeds they operate in line with their website URL, such as Instagram, Facebook, or Twitter. Affiliate links are prohibited on some social sharing sites, such as Pinterest and Tumblr. When posting content outside of Etsy, it is the Affiliate’s responsibility to follow each site’s policies on affiliate link