Since there is no user guide available to consult, I believe that the only way to print a blank superbill from UroChart EMR is to load it from the template and then proceed with the printing procedure. If if's necessary add a few spaces where you normally type the information. If it doesn't allow you, then it means that the superbill needs to be filled with data because UroChart EMR needs valid data to be able to print it.
There is the official website and its support you can access to get in touch with the developers: https://www.besse.com/contact