How to start working on the hunt?

[Bixby]

Is that not a site that uses a radar program? Or just people that report in when hunts showed up, died, etc.

The latter. It's explained right on the site (once you choose a server):

How it works:
Every player is able to report kills, by simply clicking on the corresponding button. As soon as a kill gets enough clicks the system will aknoledge it, the window will close and the timer starts anew.