Restrict to a specific product?

Hi,

love the plugin!
But like the topic states, I would really need to restrict the generated coupon to just one product.
I saw the generated coupons in the overview, and if I edit them i can restrict them to a product manually, so i think this should be possible.
Only porblem: I don’t know how ??

any help would be apreciated

kind regards,

Tibor

The page I need help with: [log in to see the link]