RocketChat meteor project folder


Trying to follow the instructions here for setting up CCTV:

I hit a problem early on when running this command: meteor remove rocketchat:webrtc

I keep getting this response:
remove: You're not in a Meteor project directory.

I have tried searching for .meteor directories, and running the remove command from various places but nothing works. I know almost nothing about meteor. I have a manual installation in Ubuntu 18.04. In what directory should I run the command?