1)press play
2) Download game with steam. (it will prompt you to download steam if you do not already have it)
3) ENJOY THE GAME!!!

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Steam - Warframe is a cooperative free-to-play third person online action game set in an evolving sci-fi world. Join your friends in player-vs-enemy raids across the solar system and master the power of the Warframes. Stand alone or fight together against enemies that threaten your world.

wikipedia - a free-to-play cooperative third-person shooter video game, developed by Digital Extremes for Microsoft Windows. Players control a member of the Tenno, ancient warriors who have awoken from centuries of cryosleep to find themselves in a war with the Grineer, a race of militarized humans, and the Corpus. The Tenno use advanced armor with unique properties, called Warframes in the war against the Grineer and Corpus.

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