This task is short and simple. Firstly, take the hexahedron standing on the way of the red beam and place it under the wall where the connector stands.
Take it and put it on another hexahedron connecting the transmitter with the button - It will cause the hexahedron to float. Now, take the first hexahedron and place it on the steps and then, climb onto it and take the connector floating in the air.
Put the next hexahedron under the step where the connector stood and put the connector back there whilst connecting red transmitter with button. Place it as near to the edge as possible.
Now place the hexahedron on the fan under the red beam. Approach the red button and block both of the beams with your body. When the hexahedron falls, you can jump on it before the button recharges to put you up again. From there, jump onto another hexahedron and use the lever.