Could you surf the Internet as normal? If it is, you can try to add the device manually. The light of powerline is off, you can check whether there are some devices have filter function

no, it cannot buy one device of 8630 in US

maybe you can contact with the support of USA to ask for help.

The kasa doesn't support Kindle. Obviously you cannot find Kasa app on Amazon store. Also, http://www.tp-link.com/en/faq-944.html for reference. I think the first thing you can do is to install kasa...

Check your modem first. Would you always get 90Mpbs from the modem? It's been acting like this since you bought the router? Or it just started recently? Try firmware upgrade and hard reset the router.

You need to make sure your can get the IP from the router on your computer or phone, should be something like 192.168.0.X (0 Rouvie wrote Both, unfortunately @Shield101 All lights have gone off and...