How to print a paper horizontally?

I want to print a paper horizontally, not vertically. I want to make a brochure, and 3 vertical collums are too small, how do you print it horizontally. PLEASE HELP
Update: If you know it then could you please state it, I'm really not in the mood for jokes.
Update 2: THANK YOU NICHOLAS C!!!!!!!!!! It was short simple and answered my question
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