Usually, all you do is grab the door and lift up so the door goes over the bottom ridge and walla its out.
Some, you have a screw that you loosen and this makes the wheels actually go up into the door frame, making it easy to do the same as above.
When you reinstall, you screw the wheels up in the frame and when on you screw the wheels down to lock the door in the groove and riding on the wheels.
Good Luck and don't drop the door.
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