If possible, you could add a photo here instead of text.
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This will add the second app to the stack so you can move them together.
Then simply drag your finger up or down the screen to zoom in or out respectively.
You can do this from the photo or video modes in the camera app.
Then with one finger, slip the app out of its slot so that it hovers between rows.
But if you do, this is your chance to let people know.
That's the signal from Apple that an app is ready to move.