Leaderboard? – Cylinders Review

Good game especially to play on an Apple Watch but I can’t figure out how to put my score on the leaderboard. The high score said 50 sum and I got 40 which should be 4th place but I don’t know how to put my name on there and I don’t see it on there either. How do I see myself on the leaderboard?
Review by Jazzy2Cute_G on Cylinders.