By sliding the foreskin as comfortably as possible. Get an estimate of ring size diameter

Lubricate with extra virgin coconut oil or castor oil. Apply the oil to both the foreskin and the phimosis ring

Lightly press the ring against the glans to tilt it slightly and thus insert it inside the phimotic band (or foreskin).

The phimosis ring should not be too tight or too loose, it should fit perfectly. If the ring is loose, try using a size larger than the current ring size