Before you start assembling the next layer, you will need to hold the cube so that the first layer assembled is at the bottom.
We find on the top layer such median rib cubes, where there is no color which is the color of the top side.
Rotating the top face, bring the median rib cube to the desired location, paying attention to the color of the central sticker of the adjacent face.
Before further rotations, install the cube so that the side, where the middle rib cubes will change places, looked at myself. At the same time, the collected first layer must be at the bottom.
If the cube needs to be moved to the second layer to the right, take the top face to 90 degrees clockwise, and raise the right face to 90 degrees upstairs, then return the top and right faces to place. Next, turn the top face 90 degrees counterclockwise, turn the front face 90 degrees counterclockwise, then look back the top and front faces to place. The cube falls into its place in the second layer.
If the cube needs to be moved to the second layer to the left, draw the top 90 degrees counterclockwise face, the left face is raised 90 degrees upstairs and turn the top and left faces into place. Then draw the top face 90 degrees clockwise, the front face is lifted 90 degrees upstairs and turn the top and front faces into place. The cube falls into its place in the second layer.
After the middle edge elements from the top layer stand on its place, the second layer will be collected.