Summarize the following:
Don't brush your curls because that will create frizz. If your hair is tangled, you can go through it gently with a wide toothed comb. It might also be a good idea to have both of your hair ties on your wrist, ready to go. With a wide tooth comb pull little strands of hair out of the bun. You can also just play with it until some hair falls out. This will keep it together for the day.

Summary:
Start with dry hair. Touch your bun up, if needed. Grab your hairspray and spray a generous amount of hairspray into your hair. Finished.