i found an instruction from their official website, maybe it can help you ! http://www.tp-link.com/en/Article/?id=46

What is the username you put into the modem? Last time I configured my modem and only typed the first part of the e-mail address. The modem could not access the Internet. I talked to the tech from...

T he signal strength can be influenced by a number of things. Here are some suggestions for you. try to change the channel to 6(you may also try 1 or 11)on your wireless router. Upgrade the latest...

How far is the adapter from your router? Any obstacles between them? Do you have the same problem on other wireless clients? Have you tried unplug the adapter and connect it back?