How do I use the Leaderboard in the Scirra Arcade?

I want to link the highscores with the leaderboard, so I used the "Scirra Arcade" object in Constructor but I don't know how to use it properly.

I have use the ["submit hi-score"of highscore] (where highscore is a variable) when you finish the game and the

["on hi-scores recieved"--> "Request hi-scores page 1 with 10 results per page (include guests: yes)]

Thanks a lot