Adding 'seats'

Hiya everyone

I am almost new to Norton and I was hoping to get some help with adding a couple more devices (seats wink ) to my subscription. I already have 3 devices, I would like to add my missus as well, totalling 6 devices. 

As I said I already have 3 devices, but I have forgotten how to add more as I have memory problems, so, if there is some kind soul out there in Norton cyber world who could help this old codger I would appreciate it.

Thank you for your time

Rick