To print envelopes and labels, you must use a program, such as a word processing program, that provides these options. Check the information that came with the program you want to use to see if printing envelopes or labels is supported.
Some programs allow you to create a single envelope or label, while others help you create mass mailings with features like default return addresses or customized shipping labels. You might be able to choose font types or sizes, add images, or customize the layout of the information. Make sure you know the size of the envelope or label you are printing to, because all programs will require this information.