To put backspin on irons, you must first understand the fundamentals of a good golf swing. Start by ensuring your clubface is square to the target line, and your hands are ahead of the ball at impact. This will ensure that the grooves in your clubface make contact with the ball and impart spin. Create an ascending blow with a downward strike angle to help increase loft and generate more backspin. Finally, use a light grip pressure to reduce spin from wrist action while maintaining control over shot direction. With practice, you can master this technique for consistent results on every iron shot.