At the top of the Whiteboard page is a two-week calendar. This calendar will display the WODs your gym has planned for you, any Tracks or coaching programs you follow, WODs you've planned for yourself, and workouts you've logged via the "log"=>"workout" navigation. A WOD will appear in a specific color based on the Track it is associated with.
You can log a result for a WOD displayed on your Whiteboard calendar by following the directions here.
You'll know a WOD result has been logged because the icon next to its name will change. An unlogged WOD will display a bullet point. A logged WOD will display either a lightening bolt (if the result is a PR) or a note pad.
You can view, and log for, previous week's WODs by clicking on the back arrow.