Always burn your candle in a safe, heat-resistant place, away from children and pets, draperies, loose bedding, fans and drafts.
Never blow out your candle. Always extinguish the flame by dipping the burning wick into the wax to put out the flame and also prime the wick for the next burn. You may use special 'wick dippers' for this, or even a kitchen knife or pencil. Make sure the wick is then in an upright position.
After the wax cools and solidifies, trim the wick to 1/4 to 1/2 inch long, and remove any trimmings from the candle.