Pre-flight 101
Prior to arming the H in preparation for take off, place all the switches on the ST-16 in a position "away" from you, except the one on the furthest right. This switch arrangement also locks the camera facing forward to always align with the front of the H, and puts the gear switch in the down position. The right most switch is your flight mode switch. Away from you is Smart mode, middle is Angle mode, and bottom is RTH, which will not allow you to take off with the switch in this position. Decide what mode you want to take off in and position this switch accordingly. Position the gimbal knob in the center detent.
Place the sliders on both sides of the ST-16 in the upper most position. The left slider will aim the camera to the highest point the switch position will allow, and the right slider will then be in Rabbit mode for the fastest control response. You can adjust this one to a slower speed after take off and getting into a hover 6-10' off the ground.
For the gimbal switches, the left most switch controls the maximum elevation of the camera. If you like to fly as fast as you can or like seeing your props in the imagery all the time, place this switch in the lowest position. For most flights the upper position works out the best. The middle position does nothing.
If you want to pan the gimbal you will have to move the middle switch towards you. You will also need to move the gimbal knob away from the center detent. If you move the gimbal knob away from the center detent and leave it away the gimbal will continue to rotate at a speed relative to the knob position as long as the knob remains away from the center detent.
Play with this stuff on the ground a little to learn how it all works, and read the quick start guide and the revised manual in this forum.