This is also covered in the control gui section
The Guider control window is in the Wheels gui. First like the Base Rotation one selects the Guider Arm Speed (fast or slow). Then click and hold the Out button to move the guider arm out of the stow position. Keep holding the out button down until a suitable guide star shows in the guider camera window. Once a star is found, focus the star with the Guider Focus control buttons in the light blue frame just below the Guider arm control frame. When guiding is done and you want to slew to a new location, press the "stow" button to send the guider arm back to the safe (overexposure safe) location.