The quickest and easiest way to set axes is on the Quick Entry Screen.
First - set the shape of the axes using the axes shape scroll bars. The centering buttons return the axis back to the middle. This makes it easy to get graphs such as
Second - set the x and y maxima - everything else is automatic
Note, setting an x maximum in terms of pi (eg 2pi) will force FX Graph to write the x axis scale in terms of pi.