there really isn't that much in the way of instructions for gyros like this. there are only two adjustments, gain and nor/rev switch. if the heli is spinning in circles and won't stop then the nor/rev switch is probably on the wrong setting. the gain will determine how well the tail holds, over 50% is hh, under is rate mode. turn the gain up until you notice the tail hunting (moving back and forth quickly) then move the gain down a bit. keep adjusting until it's at the best spot to hold but not hunting. you must unplug and replug the battery in every time you make an adjustment to the gyro in order for the change to take hold.