This step will finish off the corners on our third layer. In the last step, we got those pieces into position. In this step, we will rotate them so they look like they will for their final position.
While the concept of this idea is a little harder than the last move, it is very similar in the steps themselves, so it should be much easier than starting from scratch.
This technique will rotate 3 corner pieces at once. Figuring out which ones to rotate is the hardest part of this step. The ideal scenario is to have one corner in the correct rotation.
With the piece that won't move in the back left side, rotate the cube 180 degrees towards you so that that piece is now on the bottom front left.
With the starting position ready...