Make sure you have the latest version. This is one of the extensions that’s not in the Inform 7 IDE library, and was available from the I7 website extension section which wasn’t accessible last time I checked.
HC has really good documentation, although it may seem complicated at first. Both I and Steph C have used it extensively in games like Zozzled, Brain Guzzlers… and Fair. Once you comprehend the flexibility, it manages to do a lot of things other than just present choices.
I attached a copy of v7 to this message:
I’m happy to assist if you need specific help with it. I got it to do even more complicated things, and worked with AW Freyr to figure out code that essentially diverts any parser interaction with a character or a potentially complicated implementation to a choice menu.