Hi Deanna:
You may be able to get this working using the wix-fetch API and pintrest’s REST API .
If you aren’t a developer this might get involved though. You need to register your site with pintrest so that you can get the necessary OAUTH tokens etc. Then you will need to develop the REST fetch calls in a set of backend function calls because you need to protect the tokens you use for pintrest access.
Your page (site) will need to manage the pintrest account and password information and session that is started (opening and I suggest closing the session).
Giedrius’s suggestion would work and may be more straight forward but would also need you to write an html harness page for the htmlComponent that loads the pintrest javascript code and use messaging between the htmlComponent and the wix page to drive the expected outcome.
Good luck!
Steve