One by one, select each of the checkered panels. From the Edit menu select Copy Attributes From...Fill. Click on the square containing the dark custom fill (created on the previous page). Select the background (behind the checkers) and repeat the process, this time using the lighter fill.
Go into the Custom Fountain Fill menu and one by one, change the Angle setting so that each fill is going in the proper direction. Left side=180, right side=0, top side=90, and bottom side=–90.