*NEW TO ARDUINO* Can't open serial monitor MAC

Hey there,

I'm super green at programming and electronics. Bought the Elegoo Mega 2560 Project off amazon and have been trying to follow the tutorial but stuck on Making A Connection. When I click on the Serial Monitor icon, I get "Board at COM 1 not available" in orange? The tutorial makes it seem simple but doesn't explain this error. Can someone please help!

Thanks,
Jeff

Not a mac user but did you select the correct port in the tools menu? Did upload work?