How do I see what computers are associated with a product key

I have a 3 computer  license.   I have de-installed Norton off one of the computers but I suspect it's still being counted.   How can I verify this and how can I remove it so I can use the license on another computer ?  When I look at my products, I see the product key but can't get any detail about the computers.

Thanks, the were able to help me.

I have a 3 computer  license.   I have de-installed Norton off one of the computers but I suspect it's still being counted.   How can I verify this and how can I remove it so I can use the license on another computer ?  When I look at my products, I see the product key but can't get any detail about the computers.