How to make the cute faces on my iPhone?

I have an iPhone 4S, and I was just wondering how to make the ones like purses, thumbs up, etc.

Download an app called 'Emoji' and then when you open the app for the first time it should tell you how to set it up on your keyboard.

I have the iPhone 5 and I have no clue I'm sorry but you can go on YouTube and see how to to it