I assume you have access to create new leaderboards so going to /admin/plugins/discourse-gamification/leaderboards from your Discourse instance should show your boards.
Selecting the board will display the id of the board in the URL.
In the Right Sidebar Block component (/admin/customize/components), select Launch Editor from the Theme Settings:
Then configure your block with the name minimal-gamification-leaderboard and in the params section, add the id of the board. There are a few other option available for that block - as you can see here I’ve limited to number of entries show to 5 using the count param.
