In this step, you are going to learn how to permute the corners on their solved position, but not actually solving them.
You are going to learn how to permute the corners with this algorithm
Algorithm: R U' L' U R' U' L U
What it does is swaps the corners in the top right, top left, and bottom left.
YOUR GOAL
Begin by finding a corner piece on a top layer.
Look on the corner piece that looks like solved but twisted the wrong way(shown in figure 1)
If you don't see any, perform the algorithm. Then look again
if you see one or more corner pieces put one in the bottom right corner.
Then perform the algorithm.
If you only have one, perform the algorithm but look after you finished the algorithm, then repeat the process until they are in the right position but no actually solved.
Note: There are 1/10 changes you can skip the last step.