How turn left or rigt during pushback?

The instruction is ctrl P and then button 1 or 2 for left or right but i think this has succeed like one or two times. If i press all this buttons several times the only thing that happends is that i get short commandos for different panels.
When do i press the 1 or 2 button two make it turn?? :-?
When do i press the 1 or 2 button two make it turn?? :-?