How to activate Photoshop CS6 Extended on new computer

I got a new computer.

My last computer had a liscensed copy of photoshop CS6 extended which I purchased in full in 2012.

Now I need to reinstall photoshop CS6 Extended on my new computer.

I have the free trial installed currently.

I can not find where I can install my product key.

I do have a product key.

I own the copy, I do not pay a monthly bill for it and I have been doing so since I purchased the liscense in 2012.

Any help is appreciated.

(Moved by Moderator)