It's made in China so there is no quality control. Might be broke from the factory. If it is I wouldn't be surprised.
The manual being written in what is most likely some heavy chinglish can make you think what the manual says is actually what you are supposed to do.
It's a better bet to just guess. I have never seen any TX that would not put yaw and throttle on the same stick. If your left stick makes the quad roll and the right stick is making it yaw, then the left stick must also be pitch and the right stick throttle. If that is what you have then you are already in mode 1.
Mode 2 is throttle and yaw on left stick. Mode 1 is throttle and yaw on right stick.