Hi, Do you use the http://tplinkrepeater.net or IP address to login? And did you try login before you configure the extender or when the extender is working?

On your computer, press Windows key + “R”->type in ”ncpa.cpl”->right click the “Wi-Fi”->Status, what's the Speed on that page? Are you connected to the 2.4G or 5G? Try change the wireless channel and...

The adapter is only compatible with kernel 2.6.18 ~ 3.10.10

Are you using SoftAP function? What's the OS of your computer?

Hi, you should enter the wifi password of your router, contact your router's support to find the wifi password.

Hi, I think it's better to email the issue to tp-link support at support.uk@tp-link.com.