Summarize this article:

Plop the ball into the bowl, and roll it around with a fork or spoon until it is evenly coated.  You will be coating the cookie balls one at a time. Some people find that it helps to use tooth picks to lift the cookie balls out of the chocolate. Give the cookie ball a little shake, if you need to, to get the excess chocolate off. Don't worry if the chocolate starts to pool at the bottom of the cookie ball. You can trim it away using a sharp knife after the chocolate hardens.

Summary:
Dip and roll a cookie ball in the melted chocolate. Gently lift it out of the melted chocolate, and let the excess chocolate drip off. Place the chocolate-covered ball back onto the baking sheet.