To program a device, MProg must be in Program mode. Click on the "Program Devices" button on the toolbar.
If the "Only Program Blank Devices" box is checked, then MProg will not try and reprogram any pre-programmed FTDI devices it finds. If this selection is unchecked, then MProg will attempt to program every device it finds on the host PC.
Note: to change the "Only Program Blank Devices" box, you must first enter Edit Mode by clicking on the "Edit Mode" button. After changing the option, click on the "Save" button which will return you to Program mode.
After programming is complete, MProg will display a message showing how many devices it has programmed.