How can I "edit points" for freeform in Storyline

Shucks, I spent an hour trying to figure it out. In Captivate I can hold down the alt key and drag a shape point to a new position, and in my Adobe PS, Illustrator, I can also do so. I'm trying to show my company's computer screen on an image of a person sitting at the computer. The screenshot needs to have the angle changed to make this work elegantly.