The easiest way to learn how to use a new calculator is by trial and error. This calculator is very powerful if you know how to use it, but it can be confusing at times. (though much less so than the more powerful TI calculators. I digress) If you do not have time for trial and error though, you could find a user manual online at: http://www.education.ti.com/guidebooks/graphing/84p/TI84PlusGuidebook_Part2_EN.pdf
And a helpful hint in general, if you are looking for a specific function that you can't find using menus, try looking in the catalog.
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