So we are on the same page, I assume you mean the text under ’ Overview of the Notebook UI’ here that says:
“The notebook has an interactive tour of these elements that can be started in the “Help:User Interface Tour” menu item.”
I think the note is outdated with how you are meant to find this these days.
I think the easiest way to get to what that is referencing these days is to go to the main page of Try Jupyter here and click on the tile for ‘Jupyter Notebook’. Then the notebook session will start and in the bottom right corner, you’ll get a prompt box you can click to ‘Start now’ under ‘Try the Notebook tour’.
It is also accessible from the ‘Help’ menu under the main tool bar. It at least works until step 7. I guess the notebook content it takes you to is supposed to take over after that?
As for edit/command mode:
In general this may be a good guide to follow here.
You’ll start out in edit mode usually when interacting with cells.
Comand mode is the special mode you access.
" * To enter Command mode: Press the
Esckey or click outside of the currently active cell’s editor area."
" * To exit Command mode (and enter Edit mode): Press the
Enterkey or click inside a cell’s content area."
See here for more information.
See here for more detail about the commands you can use in command mode.