A question about the pack of NIS 1 year and 3 PCs

Hey

 

I bought the NIS 1 year and for 3 computers but just wondering how can I use it for 3 computers? 

 

like if I install and activate the norton on 1 pc will the licence of the other 2 start even if I am not using it or I can like activate one now and then after a month another one or how does this work?

 

 

 

ty