1. First fill the glass about 1/3 full with leaves.
2. Place the tea light in the insert and then hang on to the glass rim.
Below are two examples of the tea light inserts. Stiff metal wire is soldered over the sides of metal tea light cups. Apparently these are not available in many locations. A DIY action may be necessary if you would like to make your own.
Here three wires are used and each are soldered to the bottom of the cup.
Here the wire is soldered across the whole bottom of the tea light cup.