Keep in mind that you cannot do bracketing (AEB) in any of the auto modes. You must use one of the "creative" modes.
When you're in one of the creative modes, when you press menu, you'll get a second "camera" menu. AEB is the first option of the camera2 menu.
You can select the gap between each exposure with the AEB option. Using the Exposure compensation when in the camera mode will slide the entire bracket up or down.
Good Luck!