Twist the lever or knob that controls the wick to expose about an inch of wick.
Snip off between 1/8 and 1/4 inch of the top of the wick. Cut straight across to produce a safe, modest flame height.
Shape the wick tip to achieve different flame effects. Trim a flat wick to a point to get a flame with a peaked appearance. Round off the top for a crowned flame. Create two points at the top for a double flame. These techniques will not work if your wick is round rather than flat.