Information on the hosted program's location is usually included in the XML file. If the program is missing, or you for whatever reason need to specify another binary at another location, use Settings - Hosted program, which brings up the Binary chooser (Fig 2.1).
The top text field should have the relative or absolute path to the directory containing the binary. The bottom one is the complete name of the binary file itself, including extensions (if any). These values can be filled in manually or you can browse for the directory and binary using the associated ``choose'' button.