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Click the Effects button.
Browse through the effects and the stock backdrops with silhouettes.
With some distortion effects, a slider appears when you move your pointer over the image. Move the slider to see how the distortion changes the photo or video.

Click the Effects button.
Browse through the effects until you reach User Backdrops.
Drag a photo or video to one of the User Backdrop frames. You can drag a photo or video from your desktop, the Finder, iMovie, or Safari.