How to use SkyAtmosphere nodes to visualize the Atmosphere?

Short Version: Please tell me how to setup the sky atmosphere for mobile, I’m a beginner and completely stuck due to this IsSky/Skydome thing. Please HELP!!
Long Version: Hey guys, I’m a beginner and working on a mobile endless runner. When I ran the level on mobile preview I got the message “On mobile the sky atmosphere needs a mesh with material tagged as IsSky and using the SkyAtmosphere nodes to visualize the Atmosphere” so I added a sphere mesh to my scene with a material with IsSky tagged but now my scene is completely dark and I cannot figure or find any tutorials on out how to do the 2nd part which is to use the SkyAtmosphere nodes to visualize the Atmosphere.
Any help would be much appreciated as I’m completely stuck here.
Thank you.