Man, Yard Darts were so much fun back in the day. It sucks that they got pulled from shelves after several kids got hit in the head and died. I took one in the shoulder as a kid, and I've got a cool scar from it. My parents didn't even take them away afterwards. Ah, yes... the 1970s. Good times, good times.
Use the Nav Sphere to adjust heading and pitch, then press AG1 to "throw" them. Just switch crafts after each throw.