Powerline extenders have their own SSID in default settings. Can you detect Wi-Fi named TP-LINK... showing strong signal? To clone SSID and password from the main router, there are two ways. 1....

I have modified the post to answer your first two questions. As to the last one, I didn't use it with multiple users on one PC.

I've setting it up in access mode, Is it in access point mode or repeater mode indeed? How did you set it up? Try to find the correct instruction here and check your configuration....

Hi Ryan, you'd better describe the problem in details here. TP-LINK may test if it is true. :) http://ticket.tp-link.com/index.php?/Tickets/Submit

@edu_ssd Are you looking for portal function? It is not supported by TL-WA7210N. EAP120 can meet your requirement. http://www.tp-link.com/en/FAQ-773.html

I don't think your WDR3600 is in good condition. Sounds like a defective unit..