Keywords and Character Tracking

hi, I’ve just started using Scrivener and I read back through some forum posts on using keywords but I’m still having difficulty understanding how they work. I know now how to create keywords in the HUD but how do I then apply relevant keywords to each chapter? Also, is there a way to track which characters turn up in each chapter? Or is that just something I type manually into my index card synopsis? Any and all advice would be greatly appreciated. I feel that I am barely tapping the huge potential of Scrivener but would love to nail some of these basics so that I can get my book organized. Thank you.

You can type keywords directly into their portion of the inspector for each scene/chapter, or you can drag them from the HUD.

I use character names as keywords, myself, and put them on each scene.