Open the cover protecting the face of the clock; the cover usually has a latch and a hinge allowing you to open it like a door.
Gently turn the minute hand clockwise with your finger. Never force the hand or turn it counterclockwise – you risk seriously damaging the movement.
Keep gently turning until the minute hand shows the correct time. You might have to advance the clock 12 hours if you need to make a small adjustment backward in time.
Close the glass face cover and wind the clock, if necessary. Wind your clock every five or six days to keep good time.