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Inspiring
September 20, 2016

File > Properties > Security > Security Method > Password Security

More info: Securing PDFS with passwords, Adobe Acrobat

brucegleeson
New Participant
September 20, 2016

When I click on Tools and then Protect it doesn't allow me to open or add this option but rather pops up with this note below:

Inspiring
September 20, 2016

As that message indicates, you need to open the file in Acrobat, not Acrobat Reader. They are two separate programs and you have both installed. Open Acrobat first and then open the PDF you want to add security to.