Buttons

Yellow Ring

     Clear panel
     Artwork facing up ^
     Button face blank

Blue Ring

Turn Upside Down:

Green Ring Grey Ring Blue Ring

   blank
   artwork down
   clear

Yellow Ring

...and push the blank into the artwork and clear layer into the yellow ring.

Pull the Green and Grey Rings out.

Flip upside down.

Insert the Red Ring and push down. Leave the red ring in.

Turn upside down and insert the Green Ring.

Compress it and you're done.