Can anyone point me to the instructions I need to follow to disable the wifi on the Fritzbox, and then to connect the TP-Link to the Fritzbox to handle the wifi side of things?
Do a hard reset on the second router.
If you want to connect two routers with an ethernet cable, so that all devices connected to either of them can communicate with each other, plug an ethernet cable into the LAN (Not WAN) port of each router, set the IP to the second router to the same LAN IP address as the first router PLUS ONE (eg. 192.168.1.2), disable dhcp on the second router, and set it to a different channel as the first."
The trouble is that after doing the hard reset on the TP-Link, and plugging it in to the Fritzbox, I wasn't able to access the TP-Link's setup page to change the IP address. I figure once I can do that, then I can disable wifi on the Fritzbox, enable it on the TP-Link and disable DHCP, then it should be good to go.