Pretty simple, to not so really.
The tank at the bottom unscrews, you light the wick and screw the tank back in. Pretty simple in the manor of how to etc. BUT tricky to make sure as you screw it back in, or the top to the base you do not drop the thing because the two parts are not connected.
To unlight the wick, there is a small wire at the bottom of the tank/unit that will pull the wick part down, or you can push it up to get more flame.
She drives me boat,
I drives me dinghy!