Here is one of many ways to temper chocolate. Tempering is achieved by adding small pieces of unmelted chocolate to melted chocolate. The amount of unmelted chocolate to be added depends on the temperature of the melted chocolate but is usually one fourth of the total amount. I usually use a whisk blender to mix the two together.
A simple method to check tempering is to apply a small quantity of chocolate to a piece of paper or to the point of a knife. If the chocolate has been tempered correctly, it will harden evenly and show a good gloss within 5 minutes.