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Hold Disarm for 15 seconds to re-level your copter. Look for the A and C LEDs to begin rapidly flashing. The accelerometer offsets will be overwritten.
Hold Arm for 20 seconds to enter in-flight leveling. Look for the ABC LEDs to cycle. This is a special mode meant to be flown in stabilize that only lasts for 45 seconds. While flying at least 4 feet in the air (to avoid ground effects) with no wind, in-flight leveling will use your stick input to fine tune the copter. Once you are flying perfectly level, simply land the copter and wait out the remaining time. The accelerometer offsets will be overwritten. The LEDs will cycle for the entire 45 seconds.