Per the below from the manual, you would send the ESC a high servo position value (using degree or microsecond positions) when the "top point of forward" is required, and a low servo position value when the "top point of backward" is required.
Setting Throttle Range (Throttle range should be setup when a new transmitter is being used)
QUIK series ( “ SET ” KEY is used )
Switch off the ESC
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Switch on the transmitter
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Press and hold the “ SET ” KEY
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Switch on the ESC
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Push the
throttle stick to the top point of forward within two seconds
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Wait for one second
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System detects the Max throttle signal, and
makes two “beep-” sounds, which denotes that Max throttle has been confirmed and saved
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Pull the throttle stick to the top point of
backward
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System detects the Min throttle signal, makes two “beep-” sounds, which denotes that Min throttle has been confirmed and
saved
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Release the “ SET ” KEY
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Setting is finished.