answer:Open the document you want to save as a PDF file. Choose File > Print. Choose “Save as PDF” from the PDF pop-up menu, and then choose a name and location for the PDF file. Edit the values in the Title, Author, Subject, and Keywords fields. You can search on the contents of those fields using Spotlight. If you want to encrypt your document, click Security Options. You can require readers to enter a password to read, print, or copy items from the document. You can choose two passwords: one for opening the document, and another for printing or copying from the document.