Adhere the candlewick to the bottom of the teacup with tacky glue or a tiny amount of hot wax.
Melt candle wax according to package. Add desired candle fragrance and color and pour into coffee cup or other desired container. To make sure the wick stands straight up you can tie a piece of thread around it and then tie it to a small stick. Lay the stick across the top of the teacup.
After a couple hours the wax will cave a little in the middle. Pour a small amount of hot wax on top and allow to harden again. Once wax hardens, cut down the wick to ½ inch above the wax.