zsh: command not found: start-bb-server

[pynbbz]

I went through the setup guide, and recieved no errors. but I get the below error when I run "start-bb-server":
"zsh: command not found: start-bb-server"

I have also tried running:
bbctl run --param 'bluebubbles_url=http://localhost:1234' --param 'bluebubbles_password=YOUR_PASSWORD' --param 'imessage_platform=bluebubbles' sh-imessage
But I still get:
zsh: command not found: bbctl

I'm new to Mac OS so sorry in advance if this is a simple question.