I am trying to set up a tp link extender
tplink tl-wa855re
To connect tp link extender to the network connect tp link extender  to the wall socket and press reset key for 30 seconds. Make sure it is close to the modem(maximum distance not more then 10 feet) Go to your computer or phone and open browser and type 192.168.0.254 in the top url bar. It will ask for your login information (default username and password is admin for both). Then it will open setup page. Just follow the instructions and your extender will get connect to the internet. Once it get configured you can connect any device with the network.
To setup Tplink TL-WA855RE range extender follow these steps:-
>Plugin the range extender into the direct wall socket near to your home router for the initial setup.
*If you made any change on the extender before, then reset the extender by pressing reset button for at least 30 seconds.
>Connect your cell phone with Tplink extender wireless network.
>Open any browser and in the address bar type 192.168.1.254 or 192.168.0.254 or http://tplinkrepeater.net
>Now you will see the setup wizard in the page, follow the instructions to setup the range extender.
>If you want you can change the name of extended network and password of your choice that you want for it.
>Now save the settings and range extender will reboot after saving the settings.
>Once extender lights get solid connect your devices to the extended network and try to go online so that we can check that extender setup done successfully.