Light: Keep temperatures above 5°C at all times. It needs lots of light or even full sun.
Water: Jade trees can hold large amounts of water inside their leaves. Water sparsely and allow the plant to dry out a little bit between watering.
Pruning: As a succulent, water is contained its trunk and branches; they tend to bend from their weight. Jades respond well to pruning, which should be done regularly to force the tree to grow branches also lower on its trunk. Do not use cut-paste though, as this might lead to rotting.