If you're looking to change the bit on your Dewalt dwp611 router, there are a few things you'll need to do. First, unplug the router from any power source. Next, use a hex key to loosen the clamping nut that secures the bit in place. Once that's done, you can remove the old bit and insert a new one. Finally, tighten down the clamping nut with the hex key to secure the new bit in place.