adding additional adapters to powerline wifi

i would like to know how to add an additinal adapter to my excisting wifi systems.

i also would like to know if i add another adapter which model of powerline adapter would be compatiable with what i already have.

i tried to get the info from netgear customer service and tech service but they were no help.

i purchased a reconditioned kit from amazon (powerline pl1000v2/plw1000v2), and it would not reconize my existing wifi system. i had to return it to amazon because there was no customer service or tech service available from amazon or netgear.

i am stuck and interested in anybody that has any suggestions

thanks ddubbed