If you did it right, you should only have 1/4" of the wick poking out of the center.
The wick needs a little starter fuel, and that can be added by rubbing the wick tip down into the exposed butter at the top.
Time to light it!
When you strike your match, hold the flame near the butter at the base of the wick. The butter needs to melt a little for the flame to become self-sustaining, so it may take a couple of seconds.