1. First, take hold of the circuit breaker handle between your thumb and forefinger and firmly push to the "off" position. When it is reset, you will hear or feel it "click".
2. Next, take hold of the handle, and move it to the "on" position.
3. Now your tripped breaker should be successfully reset!
What happens if it trips again? The circuit breaker may be doing its job, i.e. there may be an uncleared fault on the circuit, or the circuit may be overloaded.