The urge to pee means you're doing something right.
Picture the pure wand as the rocker on a rocking horse. Imagine it rocking. That's one of the methods that folks like. Insert, and then use downward pressure on whichever end is now outside of your body, pressing the other end up against your g-spot. Then rock it gently, increasing and decreasing that pressure with each rock. Keep doing it for as long as it feels good, and don't worry about the goal. It'll happen when it happens.
Alternately, you can try a windshield wiper motion, moving the toy slightly from side to side, but I find that incredibly awkward with the Pure Wand, and much easier with something like the Icicles 17.
Hopefully that made sense. It's very late at night and I should be sleeping.