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Tap the numbers in the passcode popup in ascending order.
You need to long press a key before you can start drag-and-drop. As soon as the key pops out a little, you can start moving it.
First, edit-mode must be enabled (tap the pen icon to enter the passcode). Then, double tap a key to open the key editor. Select "custom image" and pick an image from Photos or take a new one using the camera.