Middle Layer Edges
By now you should be able to solve the first layer on your own. Before moving on to this step, flip the cube so that your solved white layer is on the bottom of the cube. The next step is to solve the middle layer edges. There are four of these pieces to solve. Since the edge may be flipped in two possible positions, there are two algorithms to learn for this step. Fortunately, they're just mirrors of each other, so it's actually pretty easy.
When you're ready, move on to Step 4 - Orient Last Layer Edges.
|If the edge matches up with the color that is to the left of the two colors, you have this case. Since red is the left of the two colors, we move the top layer towards the left, right side up, top side counterclockwise, right side down, top side counterclockwise, rotate the cube towards the left, left side up, top side clockwise, and left side down.|
|If the edge matches up with the color that is to the right of the two colors, you have this case. Bring the right color to the front--in our case, this is green. Since green is the right of the two colors, we move the top layer towards the right, left side up, top side clockwise, left side down, top side clockwise, rotate the cube towards the right, right side up, top side counterclockwise, and right side down.|
|In this case (or if there is any other piece trapped in the middle layer), just put a dummy piece in place to force the trapped piece out and then place it properly.|