you should have channel five plugged in for mode control. it is used to switch from manual mode to auto-level and should have been set to +/- 25 when you started. when you're flying, open the radio menus and change the values for the channel's end point to tune it. if you slam the right stick in any direction and you hear a motor surge then you've tuned it up too much, roll it back a little at a time to get rid of the motor surging and you should be good.
they're not out of business, just focusing their resources on other projects at the moment.