Move 6 in detail

Shown below are figures to help you visualize what the steps of Move 6 involve.
I have included these to help readers accustom themselves with the notation system.

Move 6: F H-1 F-1   H2 F-1 H-1 F

Figure 12a  Figure 12b 
F: Rotate the front clockwise H-1: Rotate the middle horizontal slice counterclockwise one turn
Figure 12c  Figure 12d 
F-1: Rotate the front counterclockwise H2: Rotate the horizontal slice twice
Figure 12e  Figure 12f 
F-1: Rotate the front counterclockwise H-1: Rotate the horizontal slice counterclockwise one turn
Figure 12g  Figure 11h 
F: Rotate the front clockwise The move is complete, and has filled in the keyhole

Continue step 5