DFW is one of the easiest airports to get around in from one gate to another or one terminal to another. The Skylink train comes every couple of minutes and the pickup/dropoff points are never too far from your gate. Just look for the Skylink signs and then when you get up the escalator look for the lighted sign showing you which train to get on, since they go both directions and you want the shortest route. Very simple and fast. I wish every airport was as easy as DFW.