Select Contour Fault. 

Select the Existing Fault from the list.  The fault must be triangulated in order to select it.

Select the Contour Extents and optionally change the contour name.  Compute the extents of the selected data and optionally change the minimum or maximum values used.

Select the Contour Interval.  Specify the contour interval, the labeling interval and the size and font for the contours.

(Optional) Save the Parameters.  Save the parameters used for the operation so that the grid can be replicated at a later date.