Looks like the Nokia box is an ONT, connects to fiber and provides Ethernet. The 8-port thing above it is just a patch panel, with one line going somewhere else. The white box is the fiber interface to the street (just a junction box between two kinds of fiber cable). You want to find where that line from the patch panel goes, and attach a router / WiFi access point there, or disconnect that and connect directly to the ONT.

If you’re getting TV from the fiber, there could also be coax on the ONT, but it doesn’t look like the coax in the picture is connected to it.