How do I change the typewriter's font in PDF Converter Professional?
If the font you plan to use is installed on your computer, then you need to visit the official support page provided by Nuance to see how the font can be changed.
Support page: http://nuance.custhelp.com/app/answers/detail/a_id/5608/~/changing-the-default-font-properties-for-the-text-box-tool
In the text tool box, you can use any font you like as long as it's installed properly in the C:\Windows\Fonts folder.