WiFi gateway flashing yellow light

I’m a new user who signed up today, but I can’t get the blinking yellow light to stop after plugging it in and connecting to either one of my two coaxial outlets. 

We have never used this xfinity tv or internet at this address, so I’m not completely sure the cable signal is coming into the house. Is there a way to troubleshoot that? Is there anything else o should be doing to make this work?