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As the5barrons said, first make sure it's enabled. You'll find it under Settings / Language & Keyboard. You can choose to make it the active keyboard in the same place, as well as tweaking individual keyboard settings.
Once it is enabled you can quickly switch between all enabled keyboards. Just long press in any text entry field, and choose input method from the menu. You'll see a list of all you keyboards. The keyboard you choose will become the new default until you change it again either in Settings or via the long press method.