Newbie needs help with Calibre installation

Hi, I’m in Montreal, Canada.
Having a problem figuring out how to post (this is my first forum)
Am looking for help reinstalling Calibre on my macOS Ventura on a macstudio.
I tried putting code I the terminal app like it says in Calibre troubleshoot page. Nothing seems to work.
I am not sure which thread to post in or how to get there.
Hope I will be lucky to benefit from your experience and kindness to a newbie.:help::thanks:
Michele