In the old version, there used to be a repeat option, but I could not find it in the new version.
The repeats are in the Bar line choices. Press B and choose Master Repeat Open, Master Repeat Close, etc.
Although the message does not say so, I assume this is in reference to the NWC2 Viewer. The Viewer does not have a repeat option for play back at this time.
Preview 1.2 of the Viewer (http://www.noteworthysoftware.com/nwc2/viewer.htm) includes a repeat capability.