How to use Flipster app?

Excuse me, could you please elaborate on how exactly one goes about using the Flipster app? I'm a bit of a novice in this area and would appreciate a step-by-step guide. Is there a specific process I need to follow to get started? Perhaps there are some key features I should be aware of before diving in. Could you also touch upon any potential challenges or difficulties that I might encounter while using the app, and how I might overcome them? Your insights would be invaluable.