Restore the U(up) 4 edge blocks, your goal:
This is the last step. There is only one formula RU’RURURU’R’U’R’R’. The edge blocks that do not need to be exchanged are placed on back face, using this formula, front right and left edge blocks of the up layer can be exchanged counterclockwise. If you can’t find such a face you can get such a face by run this formula.
You have learned 9 of the 9 formulas, so believe that your Rubik’s Cube has been restored. :)
9/9