Three layers must be loaded into ArcMap before starting this tool. The first is a point shapefile representing the source locations with the following attribute fields: i) a unique ID field (preferably long integer), ii) a field representing the number of points that are redistributed from that source (integer), and iii) a field representing the functional distance radius to use from that source (a double precision number or integer). The second layer is a polygon layer representing the boundary inside which the points can be redistributed. The third layer is the raster layer representing the probability surface.
Setting the output folder. When you press the yellow folder button an interface opens that allows you to select an output folder. The output folder should be completely empty. You can either pre-create the folder in Windows Explorer, or use the "Create New Folder" button in the interface. Note that when you navigate to the folder that contains your output folder (i.e. the parent folder) you need to single-click on the output folder and then press the Add button - if you double-click the output folder, it will simply open that folder and wait for you to select a folder (not what you want to do). Thus this interface for selecting folders can be a little confusing (just remember to single-click, not double-click).
Saving the functional distance rasters as output. If you select the option to save the functional distance rasters as output, then one raster will be created for each source point and placed in a subfolder called "fdr" (functional distance raster) in the output folder.
The redistributed point output. The output of this tool is a point shapefile containing the redistributed points from all the source points. The attribute table of this layer contains the unique ID value of the source point (so you can distringuish which points can from which sources), and the number of point (i.e. if you specified 100 points to redistribute, the points will be numbered 1-100).