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help im very dumb

Hi i cant figure out how to mass select units with the box that shows up on screen. know this is possible as i saw it in recent game play on youtube. please help me out i love the game but as said, im very dumb.
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Ape Apps, LLC is an independent software development company founded in 2010 by Brandon Stecklein. Over the years, Ape Apps has published over 400 apps and games across various platforms. You can get in touch with Brandon on Twitter or by leaving a post on his wall @bastecklein
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