If you want to conduct tournaments with your Academy Elo Ratings, you first have to enable the Academy Elo Rating systems for your academy. You can learn how to do that in this article.
After that, you have to select the appropriate rating system when creating the tournament.
At any point in time, you can check the rating system of the tournament in the “Details” tab:
You can see the player’s rating in the ‘Rating‘ column in the “Players” tab:
After the tournament is completed, you can see their updated rating in the ‘Final Rating‘ column, as shown below: