I have had an AV600 situated in my office working almost perfectly with my Router, about 10 meters distance, for some time. 

I need to have better wireless in another room so I bought another AV600.

When I use the TP-Link utility to name the device and assign it a password it always changes the data for both so that I still only have one WiFi to log in to. It doesn't matter if I use the app on my iPhone or the T-Link app on my mac. 

What am I doing wrong?

-Paul-