This article refers to Apple Configurator version 1. Apple Configurator 1 has since been superseded by Apple Configurator 2 and the process for managing devices is therefore different than explained here. If you are still using Apple Configurator 1, these instructions are still correct.
If you’ve not used the Apple Configurator app before, it’s a slightly unusual application to get used to. I’ve been managing servers and applications for many years and even I found it took me a while to get confident and comfortable with Apple Configurator.