First, we just updated the viewer and serveral FODDs yesterday, so make sure you are current.

Click the leftmost button on the toolbar in the left corner, or the FODD button at the bottom, and the FODD wizard is displayed.  Pick the device you want to read from, and the type of data that you want to read (harvest, as-applied, etc), and then click Next to navigate to the location where you have the data.