How to set-up imessage on Ipone IOS 6?

I wanted to Set-up IMessage on the IPhone. And i visited the Apple website and I have a number but i Don't know where to send or receive messages. And i thought there was an App.

You need to sign in with you apple ID in the settings under the app store.iMessage is your text messages. When you send a txt and it shows up blue it is using imessage. When it is green it is a standard sms.

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