How do I password protect a PDF document on a MacBook Air?

I am trying to password my PDF documents on a macbook. I don't understand why the help options are not assisting me. Can someone help me please?

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Legend

In Acrobat, open Document Properties, then select the Security tab.

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Legend

If that doesn't work it may be that you don't have Acrobat. This is not the free Adobe Reader but something fancier.

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