There are many features in the ibotta app....many tips & tricks to learn along the way, but the best way to start learning it is to start using it.
Here's a play-by-play list of what I recommend for a newbie to do to begin familiarizing themselves with the app:
Before you go to shopping:
While you are shopping:
After you make your purchase:
NOTE: Again it is not essential that you start with Walmart, but (in my opinion) it is definitely the easiest for a newbie.