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 the collection or product page on your website that you want to send them to, 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 collection or product you want them to request from your store. Now try adding that link to your Quick Invite template!