Step-4
Orienting yellow cross

Look at the yellow edges. You should get one of these 3 cases:

Hold them in the positions above and do this algorithm:
F R U R’ U’ F’
This is just an “F” move, then the sexy move, then an “F'” move.
After the algorithm, you will either get another of the above case.
If so, match the new case on top and do the algorithm again.

Once you are done, you should get this case: