There is a trick to securing a bun (or any updo) with hairsticks.

To make a simple (or “cinnamon”) bun, pull your hair back into a ponytail.  You may secure the ponytail with an elastic if you wish, but this is not necessary.  If you are right handed, hold the base of the ponytail with your left hand while twisting the length of your ponytail clockwiseuntil the base of the ponytail begins to coil upon itself.  Allow it to coil and continue twisting the length of hair while continuing to coil the hair around the center of the bun clockwise.  It helps if you try to hold the center of the bun down to keep the coils from stacking under the bun.  Tuck the last few inches of ponytail under the bun. 

Your bun may look more or less like this (pardon my freehand 😉 ):

Cinnamon Bun

Now, take a hairstick and place the point of it in one of the top red spots shown below, but aiming in the direction of the green arrow:

Hairsticks in Cinnamon Bun

Let’s say you’re starting with the upper right corner of your bun.  You’ll be aiming in the direction opposite the direction you intend to wear the hairstick.  Grab some scalp hair with the point of the hairstick, and now flip the hairstick tip back under the bun aiming for the lower left corner.  While under the bun, the stick needs to go through each coil of hair; it is best to “weave” the stick through the hair, up and down a bit under the bun, grabbing scalp hair as you go.  (Those blue dashed lines are under the bun.)  Exit the bun in the lower left corner through the outer edge fo the outer coil of hair.  Repeat on the other side.  Remember to grab scalp hair with the tip of the hairstick as you flip directions, as well as under the bun itself.

You can also wear the sticks parallel to each other like this:

Parallel sticks

You may add hairpins, if needed around the bun. 

Here is an example of a classic cinnamon bun held with hairsticks:

Cinnamon Bun