Ring 2 Wiring Issue

Hey Everyone! I am having trouble hardwiring my mom's Ring Video Doorbell 2. Prior to my stepdad passing away, he had set it up and I have to believe it was hardwired since it was done nearly 1 1/2 years ago and the battery was never charged after it was up. Long story short, I am not sure how he wired it and can not figure out for the life of me how to do it. There are four wires coming out of the wall. Prior to the Ring, they had a doorbell with a communication component to it. In the picture attached, the blue wire is solo. The reasoning behind it is, if any of the other 3 wires touch it, they set off the doorbell to constantly ring and it won't stop ringing. Any help would be much appreciated. Thanks!