The app opens to a timeline, which shows every instance when one of your recipes does its job. A recipe can be anything from saving images you post to Facebook to your Dropbox account, or texting you tomorrow's forecast.
Swipe left in the app to view all of your recipes. You can tap any of them to edit, or tap the green slider to turn it off.
When you create a new recipe, you have to choose which channel -- online service that IFTTT supports -- you want to use. Each channel has its own set of triggers (which initiate the recipe) and actions. Swipe left and right on the row of icons to pick the channel you want.
One you've picked the channel, trigger and action for your recipe, you can give it a description and save it. If you need to edit it at any time, you can also do that in the app.
The IFTTT staff put together a few themed collections of recipes for the Android app to help you get started.
You can also browse featured and trending recipes from the robust IFTTT community.