How do I get melted candle wax off a cloth tablecloth?

You can take a paper bag and an iron to get it off.

Place the paper bag over the wax and iron the bag. The bag will absorb the wax. However, depending on the color of the tablecloth and the color of the wax, there may be some permanent discoloration.

You could try Ice as well

You got some great answers here already. The wax isn't that hard to remove, both mentioned methods work. The pigments from the wax may be permanent. This might be one step more effective. Stretch the table cloth over a bucket or strainer, boil a kettle of water with a dab of washing detergent in it. Pour the boiling water on the stain from about 1' above the cloth so the streaming water hits hard and goes through the cloth. If the cloth is white I'd add a touch of Oxy Clean or even bleach, white cloth only.