Hello Dan,
The Configure Change Detection screen is accessed through the DAQ Assistant.  After placing a DAQ Assistant, and selecting a Digital Input task, you will come to the Task Configuration dialog where you can change the channel settings (input range, terminal configuration, etc.), task timing, and task triggering.  
In the 
Task Timing tab, select one of the hardware timed modes--anything other than 1 Sample (On Demand).  Once this is done, the 
Clock Type selector under 
Advanced Clock Settings, will become active.  If you select 
Change Detection, a Configure button will appear.  Click on that button to get to the Configure Change Detection screen.  I hope this helps!
Best regards,