Add leaderboard sets to an app version

From My Apps, select your app. The page opens with the App Store tab selected.

In the sidebar, click the app version under your desired platform, then navigate to the Game Center section.

Click Select Leaderboard Sets in the Leaderboard Sets section.

Choose the leaderboard set(s) that you want to include by clicking the add button (+).

Under New leaderboards, select the leaderboards that you want to include in your app version.

Click Done.