The last step is to solve the remaining 2-color pieces with Move 5.
With white on top, hold the Rubik’s Cube with a solved side on the left, if you can, and do Move 5. If you can’t (no sides are solved), do Move 5 with any face forward and check again.
Optional shortcut: If the front piece needs to go to the right instead of the back, reverse the U turns.
Got it? Well done! Congratulations on solving the Rubik’s Cube!