PDF documents work differently than web pages in that there is not really a concept of margins. Instead, you scale the PDF to fit within the boundary of the paper you are printing on. In most cases, you won't have to pay attention to margins or other printing variables. The PDF will print as expected without any configuration. If you run into problems with PDFs not fitting on the page, you can select "Shrink oversize pages." Scaling the PDF down in the print dialog can help in situations where you need more room for binding.