How to make my IPhone 6 do that new voice recording text?

That new feature that just came out in the commercials… How do I do that?
I have IPhone 6 64 gig (not the plus) and have Sprint service.

When you buy the phone, the iphone 6 in the box to use guide

In the Messages app, on the right side of the place where you imput text, there should be a button with a picture of a microphone. It is horizontally across from the camera button. Tap and hold to start recording. Once you are done recording, slide your finger up to send the recording or slide your finger to the left to delete the recording.

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