mini cnc

servo motor(tower pro mg90s)
two a4988
two dvd stepper motor
arduino uno
software arduino IDE .UNIVERSAL GCOD SENDER.XLOADER.BENBOX
i did control the two stepper motor for X AND Y AXIS it goes very well using universal gcod sender but for Z-axis i have the servo and i don't know how to control it with universal gcod sender or benbox

(NO CNC SHIELD )