I cannot manage ADE to where I can select a public Library book , download it, and transfer it to my Kobo

I am a Pre-technolgy old person.  I spent 2 hours having a CHAT with your very patient and polite Adobe agent.  I got cut of due to a short poet outage.  I then went to our Public Library and got instructions from the Technical Support manager.  However, either I have a mental blockage or something is missing in the directions I get.  I have installed Adobe ID, Adobe Digital Editions and I have Overdrive (the program  that accesses public libraries).  I seem to be all dressed up technically with no place to go!

I use an IMac desktop and I have the latest OS software.

Barrie Richardson