True Fitness Touchscreen Elliptical Owner's Manual page 11

While standing beside the machine, loosen the knob approximately one turn
(counterclockwise) and pull knob to disengage pin.
Raise or lower handle to a comfortable height setting from 1 to 5. A position
that places the user's hand at or slightly below the shoulder is recommended.
Make certain pin is fully engaged and tighten knob securely (clockwise).
Repeat procedure on opposite side.
Upper Exercise Arms
Chapter One: Basic Operation
ESX Touchscreen Owner's Guide
11