https://adespresso.com/academy/blog/step-step-guide-pinterest-marketing/
You must have a business Pinterest account in order to access and run your own promoted pins campaigns.
How to Create Promoted Pins
To access the promoted pins platform, click on the Ads clickable tab and drop down menu, which can be located in the left hand corner.
This will take you to the dashboard, where you can see the total number of impressions, engagement, conversions, and ad spend on all your campaigns in the prior week. This information can be broken down by engagement campaigns and traffic campaigns.
To get started creating a promoted pin, click on the + in the top right hand corner of Pinterest’s navigation bar, and select “Create an Ad.”