Is there a user guide for the inventory app I downloaded?

Is there a user guide for the inventory app I downloaded?

I recently installed the Multi-Location Inventory app to my account and it looks promising for my organization, but will need to be customized. However, before I  can take shot at this myself, I really need to understand the guts of this application, which is tough to do just by inference. I am not a developer, more of a fairly knowledgeable end user of similar software (like MS Access).