control audiobook play

I need an mp3 player mainly for audiobooks. The manual seems to be about downloading audible/overdrive etc. but all it says about control is that there are ‘options.’   What I need to know is how to control (like which buttons to push) the playing of the audiobook: pausing, stopping, moving within a chapter,bookmarks,…  Was able to pause once by more or less randomly pressing buttons, but couldn’t duplicate it. Have to turn it off to stop it?

Where can I find this information?