By the way, if you are new to P*otel DXP, you may want to use a different package. I designed a 4-layer board with DXP, and it is a very good package, but it takes forever to use, it is so slow to create new parts, etc.
But this is because it has so many features I guess.
For rapid design, use Cadsoft Eagle, because it is so quick to generate your own
parts symbols, and get your board designed quickly. I personally think I can work 2-3 times faster with Eagle.