I'm not sure that's something you can teach. Eventually he "should" begin lifting his leg to pee. I say "should" because my Rottweilers never did. My 12 year-old Rottie still squats. He only lifts his leg to mark.
It sounds like his "man parts" are pointed forward. My 15 week old GSD has done that a few times when he had his front paws too far back.
Hopefully it's something your boy grows out of, and soon!