WHMCS ProSites Integration

Hey there,
I am really thankful for your latest update of WHMCS MU Provisioning. I´m currently trying to get it to work.

Im stuck at this step: "Then within the admin area of WHMCS, create a product for each Pro Sites Level (as detailed above). In each product, the ProSites ?eld should match the Level name in Pro Sites."

Where do I find this "ProSites field"?
Is it just the plain name of the product?