Melt the bark or candy melts according the directions on package. I usually just microwave them for a few minutes and stir every so often until they are melted.
Using a spoon, pour some melted bark (or candy melts) on to the pretzel sticks.
Dip two pretzel twists into the melted bark. This part will get a little messy. I coated both sides by dropping the pretzel in the bark filled bowl, flipping it over and fishing it out with a spoon. Then I used my fingers to place the pretzels on either size of the pretzel stick so they looked like wings. You will want to be sure they are touching the bark on the pretzel stick so they will be attached when it hardens. Finally, decorate with some sprinkles before the pretzels harden.
Place in the freezer for a few minutes so the bark can harden. You can also leave them out (assuming it's not too hot) and they will set as well, it just takes a little longer.
Notes
The amounts you use will really depend on how much you are making. I used two squares of bark with the amount of pretzels you see above.