Turn the chainsaw off and let the chain stop spinning before checking the chain's direction. Put the work gloves on before touching on the chainsaw chain.
Pull back on the front hand guard to disengage the safety brake, allowing the chain to spin freely. Look at the chainsaw chain's teeth to see which direction they point.
Reverse the chainsaw chain if the teeth's top angle, or the sharpest angle, points backwards toward the engine. Leave the chain in place if the top plate's sharpest angle points forward, toward the nose of the bar.