[axith]

In my example, 3rd layer slice from the bottom. Sorry, I am using an unclear meaning for d I suppose there's some "more official" way to describe it... I gave a general alg for a 4x4x4 you can adjust the level of the slice you use for the d move. I flipped over your cube pic and added an arrow showing which cubie to move to match up with the proper center edge. That slice is your d move in this case.

Edit: If I'm still confusing you then it's likely how I'm trying to explain it. I generally suck at explaining things, which is why I left the teaching program at the college I went to.