To roll a kayak, I learned to reach out far with your right hand holding the paddle and have your left hand holding the paddle closest to the center of your kayak, like you are sticking the paddle under your seat. Once you have your left hand positioned under your seat on the bottom of the kayak. Pull the paddle down with the right hand and twist your hip toward the paddle that you are pulling down. Your head needs to be the last to come out of the water. With practice this should get better. Remember if this doesn't work to pull the emergency rope and get out of the boat to get fresh air.