Do you know how to log into your TP-Link router, If so log into it, click on advanced Tab, on left side of pane click on Network
Scroll or go down to DHCP SERVER & open it, on right side should show the Primary & Secondary DNS IP's, This is where you can
change or input a IP server you want to use, in Primary box field, input 208.67.222.123 This is Open DNS's server IP which is
like a Proxy or something close to a VPN you can use, instead of the one that is provided by who ever you are with (internet provider) You can also put that same 208.67.222.123 IP on the Receiver/Box as well, basically giving a Static IP or Manual IP
I have basically the same TP-Link router that you have so the workings of the Two routers are the same on how they operate.