Athletes can find themselves on their respective Country Leaderboard from their Athlete Profile Page.
You can get to your Athlete Profile by signing in to the Games site, clicking on your name in the upper right-hand corner of the screen, then scrolling down and clicking My Profile.
You will now arrive at your athlete profile page where you can scroll down to see the chunk of the leaderboard where you actually are.
If you are trying to find your position on your Affiliate's Leaderboard, it is listed on your Affiliate's Public Profile Page. You can go to your Affiliates public profile page in a similar fashion.
Once you have arrived at your Affiliate's Public Profile Page, you can scroll down and see your Affiliate's Leaderboard.