Whichever members of the family tree are displayed on the screen are the ones who will be printed:
To show/print a branch of the tree from one person "down":
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Click on a son or daughter of that person.
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Click on "Show options" at the bottom of the window
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Change these options:
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Parents: 1
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Children: 15 (or whatever seems best to you)
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Other: 15 (or whatever seems best to you)
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Click on "Print tree" at the bottom of the window
If you're trying to print a different configuration, you can generally get what you want by playing with the three options above AND changing who you click on. Tell us a little more about what you are trying to print, and maybe someone can offer more specific advice.