If the rear shock absorber specification is other then shown in the image, then contact nearest Doers mechanic to change the setting as it require specific tools. Otherwise proceed with further step. Locate the shock absorber in your bike and also the sign written on the shock absorber.
If you want suspension to be soft/hard – put the rod in the hole and rotate anti-clockwise/clock wise direction respectively.
After adjusting its better to check the play of suspension by test ride.
To tune the suspension setting or for any other motorcycle repair or any vehicle repair, contact nearest Doers certified mechanic