F curve modifiers not appearing

Hello, I am trying to apply a cycle modifier to a few keyframes to loop them. but when i select my frames in the Graph editor and hit "N" to add the cycle, it doesn't work. Thanks!

Timestamped an example video: https://youtu.be/noexK8EIwzg?t=45

screenshot:

https://preview.redd.it/l7hiejeiqop91.png?width=1030&format=png&auto=webp&s=ee68efd62b1e2bc62a65f25168d4a09e1e985f2c