You must have an 80mm printer that supports printing PDF documents, and to print you must have a bridge application downloaded on your cell phone that will allow you to send the document from STEL Order to print.
To print you must enter the document, at the bottom right click on the send icon, at this point you must select the preview format you need and then at the top click on the Share option.
The programs available on your mobile device to which you can share will be listed, you must select the bridge application you previously downloaded.