I have followed the directions to protect a document. Directions were given as go to the document, click on protect, etc. However, when I do I only receive one reply, which says "ADD" When I click on the "Add" box,, I only get an advertisement for a new Adobe plan. Doesn't my plan cover protecting documents?
As we have checked the account details using the email address you are logged into the forums, you have subscription for Adobe Export PDF which allows you to convert pdf to other formats like word. You may refer to this help doc for more info on Export PDF: FAQ | Adobe Export PDF, Document Cloud
The functionality of securing a pdf is included in Adobe Acrobat desktop application. You may refer to this help doc for the same: Securing PDFS with passwords, Adobe Acrobat
Let us know if you have further questions.