These are basic plug-and-play devices. Do these quick tests for functionality in order at the location of the Modem/Router. These tests require at least 2 of the ECB/WCB adapters.
Test 1 Loop Back TestTake both adapters, connect the Ethernet cable to both adapters' Ethernet ports, take the coax cable and connect it to both adapters' coax in/network port, and connect both adapters' power supplies.
You should get all 3 lights on the MoCA adapters. If you do, then do the next test; if not, try different Ethernet or Coax cables, then return the units to the store for replacements if there are still no lights.
Test 2 Pass-through Test
Connect an Ethernet cable from the modem/router to the first MoCA adapter then use a short coax cable between the coax in port on both adapters, then another Ethernet adapter to a laptop/desktop.
Power up the adapters and your computer should have internet access.
If both the above tests pass, then the issue will either be with the cabling between the 2 locations or the settings on the modem/router or the computer.