Found this in the online manual:
Initial set-up of the throttle end-points of the ESC:
Connect the power wires of the ESC to a fully charged battery set; making sure the polarity is correct.
Bind your receiver and transmitter first if your radio requires you to do so.
Turn on the transmitter and hold the throttle at full brake position.
Turn on ESC and listen for 2 beeps.
After you hear the 2 beeps, apply full throttle and listen for another 2 beeps.
Once you hear the 2 beeps, release the throttle to neutral position.
A beep will then sound, signifying that the ESC endpoints have been successfully set.
Note! If you do not hear the beeping sound as described above, try reversing the throttle reverse setting in the transmitter.