These are basic plug n 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.
Take both adapters, connect the Ethernet cable into both adapter's Ethernet ports, take the coax cable and connect it to both adapters coax in port, connect both adapter's power supplies. You should get all Power, Ethernet and Coax lights on the MoCA adapters.
It should like this.
If all the lights are lit then do the next test. If they are not lit try different Ethernet or coax cables. If that doesn't work and the units are within the return policy, then return units to place of purchase for replacements. If they are outside the return period please call Actiontec Technical Support at 8884360657 for further assistance.
Connect an Ethernet cable from modem/router to first MoCA adapter. Connect a short coax cable between the coax in ports on both adapters. Connect an Ethernet cable from the 2nd adapter to a laptop/desktop. Power up the adapters and your computer should have internet access.
If both of the above tests pass, then the issue will either be with the coax cabling or splitter between the 2 locations or the settings on the modem/router or the computer.