Hi there thanks for the help.
a) toggle in the upper right between pen and book - o.k.
b) as menue in the upper right I have only the 3point-menue; there is a switch to activate oder deactivate the editor-modus
c) totally lost, what you mean with “lower right”.
But I think, it’s because I’m using Mac and iPad (which Obsidian handles as mobile) and youre help is based on Windows.