Open the document you want to save as a PDF.
Choose File > Print or Command + P.
Click the PDF pop-up menu at the bottom, then choose Save as PDF.
Going to save gives you a few options, specify a location other than Documents if desired, and you can fill out author information, the title of the PDF document, subject, keywords for searching within the document, and even specify a password and editing options by choosing “Security Options” if you want to protect the file from others having unauthorized access to it.
Go to that folder (default is Documents) to find your PDF file.