Casting with a tenkara rod is a simple and intuitive process that involves a few basic steps. First, extend the rod and hold it at a comfortable angle. Next, grasp the line at the end of the rod and make a smooth, fluid casting motion, allowing the line to extend behind you before bringing it forward. Finally, stop the motion abruptly when the line is fully extended in front of you, allowing the fly to land gently on the water. With practice, you can develop a smooth, efficient casting motion that allows you to present the fly accurately and delicately.