As you are looking through the inspector fields on the Ultimate Character Controller objects you’ll see a field which looks similar to this field within the Jump ability:

This field is an Animation Event Trigger and it allows you to specify if the object should wait for an animation event before the event is triggered or if a timer should be used instead with a specified duration. In this screenshot Wait For Animation Event is enabled which means the Jump ability will wait for the “OnAnimatorJump” event.

The animation event that it is looking for can be determined by either hovering over the Jump Event field and reading the tooltip or look at the Tooltip attribute for that field within the code.