Well if you want to use KStars, it should be explained in the materials in the dmg. There are a couple of PDF's in there for getting started. Its pretty straightforward. KStars can start its own INDIServer.
There are also some tutorial videos and instruction videos for KStars on how it works on this website and on youtube. They apply to Windows, Mac, and Linux.
If you want to use INDIServer from Cloudmakers with some other software you can do that too. You can find all the documentation for that on their website.