Put the leadrope on him, and move the mare around in the stall. Give the lead rope a tug to let him feel it , then release to go forward, and use your hands to push his hindquarters around. Go both ways, then come back and do it again after a break. Then I would try taking him out of the stall into the barn, but give him the basics first.
You don't want to put Delilah on the defensive and wind up getting hurt because you have the colt!