Our product tagging with affiliate links is a feature available in select markets, you can also check this Help Center article about tagging products in your Pins. Another way to make your Pins shoppable and earn commissions through affiliate links is by using the Paid Partnership tool, a feature that lets you tag a brand you have a sponsorship, or branded content relationship with. Check out our Help Center article for more information on how to use the Paid Partnership tool, and this announcement about product tagging and affiliate partnerships on Pinterest.
Hope this helps! Give us a shout if you need anything!