[SOLVED]I want to let my custom bunny jump like normal bunnies, but how?

I'm going to assume that you are asking about the jumping movement, as that is the most difficult part of bunny movement to implement:

MCreator's feature set for entity AI doesn't have an easy way to implement this, as far as I know.

However, you could achieve the jumping effect through a fairly simple procedure to run using your entity's tick update trigger:

If [Is [Event/target entity] on ground]

do If [[[Absolute][X delta movement of [Event/target entity]] > [0.01]] Or [[Absolute][Z delta movement of [Event/target entity]] > [0.01]]]

do [Push [Event/target entity] with dx: [0] dy: [0.5] dz: [0]]

The second if condition is the most complex part of the procedure, and all it is an or check to see if the entity is moving horizontally (absolute X delta movement or absolute Z delta movement is above a tiny amount).

This procedure uses variants of the light blue = procedure block, the dark blue = procedure block, and the round procedure block (accessed by clicking on the lighter box in the middle of the procedure block, where the text is).

I hope this helps.

You're welcome.