The 2 keys are identical. On one side of each key is "left" and the other side "right" (on some keys this is in German, "links"="left", "rechts"="right"). Insert either one of the keys into the right slot (in the lower right corner) with "right" facing UP, and the other key into the left slot with "left" facing up. Slide them in until you hear them click into place, then simply pull outwards on the heads of the keys to remove the radio, then disconnect you wiring. Once removed, just push in on the retaining tab on the side of the radio to remove the keys.

Gilly