Your OPG doesn't show any abnormal findings except impacted wisdom molars. Clicking sound in common but you need to consult a dentist to confirm the severity. Accordingly you would be advised treatment if any.

Hi sir....     Your  radiographic investigation does not show any abnormalities...   Clinical examination is also essential to rule out cause for joint clicking sound.... CAUSES FOR TMJ CLICKING:       *Opening the mouth too wide while yawning or eating      *Grinding the teeth      *Chewing gum regularly      *Nail biting      *clenching the jaw      *Biting the inside of cheek or lip      *Infections f glands of mouth      *Sleep apnea(shallow breathing)      *Malocculsion ( irregularities in alignment of teeth)      * MPDS (repetitive contraction of muscles mainly in sports activity) TREATMENT :      MEDICAL TREATMENT :             *Analgesic,anti anxiety,anti depressants ,muscle relaxant             *Night guard to manage grinding of teeth             *Ortho treatment for overbite and underbite             * Transcutneous electrical nerve stimulation             *pain relieving injection in joint space              *Ultrasound,laser therapy,surgery HOME REMEDIES:             *Avoid hard or crunchy foods             *Relax jaw             *keep good posture             *Don't not over extend jaw while yawning or chewing gum             *Practice stress management (reduce stress by using deepbreathing exercise,meditation,physical activity)            *Physical therapy like facial stretches or massage.

You are having un erupted Impacted third molars. That could also cause from other reasons. Anyway you must consult an Oral Medicine expert advice who is a specialist in Mouth and Jaw diseases and cancer

Occlusal and bite problems cannot be diagnosed by OPG X-rays. Clinical examination and CBCT or X-rays of TMJ are required for that. Your X-ray is ok but you have impacted wisdom teeth that may require extraction. Consult a dentist or an oral surgeon