Help: how to activate my norton product on another computer

Hello, I have recently purchased Norton internet security and antivirus on my laptop. in the end of the purchasing procedures, I found out that i can activate the product i bought, on another 2 computers (correct me if im wrong). 

I'd like to know how i can download the product on my main computer, and activate it legally.

Thank you.

Hello, I have recently purchased Norton internet security and antivirus on my laptop. in the end of the purchasing procedures, I found out that i can activate the product i bought, on another 2 computers (correct me if im wrong). 

I'd like to know how i can download the product on my main computer, and activate it legally.

Thank you.