Adjusting the steering wheel mechanically
WARNING Risk of injury through adjusting vehicle settings while the vehicle is in motion
You could lose control of the vehicle in the following situations:
if you adjust the driver's seat, the head restraints, the steering wheel or the mirror while the vehicle is in motion
if you fasten your seat belt while the vehicle is in motion
Before starting the engine: adjust the driver's seat, the head restraints, the steering wheel or the mirror and fasten your seat belt.
WARNING Risk of entrapment for children when adjusting the steering wheel
Children could injure themselves if they adjust the steering wheel.
Never leave children unattended in the vehicle.
When leaving the vehicle, always take the key with you and lock the vehicle. This also applies to the digital vehicle key if the "Digital Vehicle Key" function is activated via Mercedes me connect.
Push release lever 
down as far as it will go.
down as far as it will go. The steering column is unlocked.
Adjust height 
and distance 
to the steering wheel.
and distance to the steering wheel. Push release lever up as far as it will go.
up as far as it will go. The steering column is locked.
Check and make sure that the steering column is locked by moving the steering wheel.