To view your gyms WOD leaderboard, open up your app and from the home page, select Today's WOD".
Scroll to find the WOD's leaderboard you want to view, and select "WOD Activity.
Scroll down to see your leaderboards.
Women and Men's prescribed and modified are on this page.
Assuming your gym has been planning workouts for its members, you will be able to view a leaderboard for those specific workouts, on those specific days, a couple of different ways.
Firstly, from your Whiteboard page, click on the workout as it appears in the calendar. From the overlay that pops up, click the "view gym results" link. The link will also display how many results are included in the leaderboard; the number is updated each time a new result is logged.
This leaderboard defaults to the results for that workout, for your gym, on that specific day. This can be changed via the filters.