First, you'll want to set up the availability of your products. If you haven't already done so, here's how: http://support.getcarro.com/en/articles/3475325-change-your-products-availability-on-carro
Once you have that product set as available on Carro:
Go to that products page on your website, copy the link and add ?carro to the end of the url.
For example, I turned this:
That new link will take an influencer directly to the product you want them to request from your store.