How to re-install mac os x on macbook pro 2012

Hi Mac friends
anybody who can step by step explain how to reinstall a new MacBook Pro ( no installtions DVD )?
007 MacBook Pro

thanks I tried that the screen menu I get is to symbols of hard disk:
1) Machintos HD
2) Recovery HD
If I select the first one I have the orginal MacBook I set up 2 weeks ago
If I select recovery HD I get Mac OS X Utilities here I can select Install Mac OS X again, if I select that it takes 4 hours and I still have the same as when I installed it first time.
I will need to complet reinstall so I have a " new " Mac Book again

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