COMPLETE SECOND LAYER

1. Keep WHITE on top
2. Find the GREEN/RED edge piece 
3. If it is in the bottom layer, then turn the bottom layer to match the edge with the centre colour (see fig below). 
4. If the edge is not in the bottom layer, then go to Step C
5. Choose from the steps below to place the edge piece in place.

Possible Problem:

The edge piece you want to move is in the second layer, but in the wrong position or the wrong way around.

Solution: Turn the cube so that the edge is in the front layer then do either solution above to move the piece into the bottom row. The go back to step 4 above.