You really should take a lesson from young children and educate by yourself to have an open head, free of pre-conceptions and inhibitions about each spirits and the unseen. With the API demos mounted (that was the -a option), you can open up https:/// in a browser (exactly where is the hostname you specified in the `bbb-install.sh` command), enter your title, and click on 'Join' to be a part of 'Demo Meeting'.