SCREENS with the WALK activity

In the settings for the WALK activity, there is the ability to populate 3 different SCREENS.  You can choose from 1 to 3 DATA fields to display on each SCREEN.  My problem is that I can only get SCREEN 1 to display on the watch.  Even though I edit each SCREEN to fit different situations, I can only get SCREEN 1 to display.  Any advice.