Using Ctrl + P or clicking on Print from the drop-down menu will open up a print dialogue box. Choose the PDF printer in the drop-down menu that lists printers. Instead of having a "print" box at the bottom, a PDF printer usually has a "save" box. When you click on it, you will be prompted to name the file and choose to which folder you'd like to save it. The default folder is normally the documents folder, but double check so you can find your file after "printing" it. When it saves, it will be labeled as a pdf and will have an icon for a pdf, not a picture or word file.