Note: The example demonstrates how to apply a constant rounding radius. See Round: Variable Radius if you want to specify different radii at specific locations.
Required Step 1 
Select edges, vertexes, or a face.
You can select an edge by selecting a point that lies on the edge.
You can drag a box to select multiple edges.
When you are finished selecting, press exit.
Required Step 2 
All selected edges will be marked with a blue circle. You can now specify a constant rounding radius (described below) or a variable radius.
Note: If a face was selected for rounding, you can only apply a constant radius.
Enter the desired constant radius in the Global Value field. In the example below, the radius is 5.0.
Click the Options field if you want to specify further information about the rounding.
Press exit
when finished. Press OK 
or Apply 
in the Feature
Guide to complete the function. The resulting rounded faces are shown
in cyan.
When completed, the Round will appear in the Feature Tree as follows:
