You haven’t actually explained what your problem is Jack. What results have you been getting from your attempts to use PhD2 so far? What is the guiding instrument? Have you succeeded in calibrating the system? Have you found suitable guide stars? What happens when you try to guide on them?
In my experience PhD2 either works or it doesn’t work with a system, and if it doesn’t, there’s some fundamental hardware problem that no changes to the default settings will make any difference to.
The first step is to enter the guiding focal length and pixel size. PhD then calculates appropriate increments for the movements. It should then be possible to do a calibration using a star. If that is successful, then it should guide.
Problems are pretty much always problems with the hardware rather than with PhD’s settings.