Rotate an object on screen

Greetings! I need to be able to rotate an object on screen on it's center axis. Just 90 degrees and in 2D. I've attempted to do it like the windmill storyline file in this discussion: https://community.articulate.com/discussions/articulate-storyline/making-an-item-spin-on-a-central-axis?page=1#reply-255684

However, I don't have the ability to edit the rotation of an object when editing states. (See attached screenshot) Please help asap. Thanks!

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