There is no need to connect to your mount from phd using ascom in the first instance. There is an option called on-camera which makes the guide pulses come out of the guide port on the camera. You'll need the st4 cable to connect that port to the guide port on the mount. When you select ascom as the camera a selection box pops up and you need to pick qhy5 off the list in that box.
Once it is looping/capturing you'll need to focus so point it at some stars. You can try and get close during the day but I doubt you'll get exposures short enough to show anything but a white screen, but may be worth a shot. The image from an qhy5 is pretty dirty, lots of lines and crap but if you take some auto darks in phd it will clean the image up a lot and make it easier to focus. There is a button to take the dark frames and a prompt to put the lens cap on the scope. If you change exposure time you'll have to redo the darks.
If all that works then you can look at eqmod which is the ascom driver for that mount. It sounds like you have selected POTH Hub which is an ascom device which manages a mount, a dome and a focuser all in one spot once poth is configured. You won't need to use poth.
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