Completing the Middle Layer
Bottom Layer non-yellow edge piece, lining up the colours
Non-yellow edge piece in the Bottom Layer insert to RIGHT
Non-yellow edge piece in the Bottom Layer insert to LEFT
Non-yellow edge piece in the middle layer, where one or more of the colours do not match up correctly
REPEAT from "START" above!
REPEAT the above process until the middle layer is complete, there are four edge pieces to complete, so you should only need to do this a maximum of four times.