A PDF is a a virtual print and is generated using a 3rd party program, called a PDF creator. Now while the MAC OS has a built in creator, if you're a PC user you must install one manually. There are a few free PDF creators that we suggest, including Cute PDF and Primo PDF, both of which can be searched and downloaded free from the Web.
Once you have the PDF creator on your system, you need to set up your drawing as if you were going to print to paper using the page layout options under the file menu. Once your happy with the set up of the drawing you will then click Print from the file menu. If your on the Mac you will use the PDF button on the left of the print dialog box, If your on a PC you will choose the PDF creator in the printer list at the top of the print dialog box and then click print. Both will then ask you where you want to save the PDF.