Wow, thank you everyone for the quick replies. Some responses:
Yes, the focuser does move up and down when I turn the knobs, but it makes no difference. All I see is a hazy blur. No sign of anything in the sky.
I've posted a photo. If I look straight into the focuser tube with no eyepiece, I see my own reflection, which I think suggests that the mirrors are working properly.
I think this might be the issue, but no combination I try helps. The focuser tube is 2", but the supplied eyepieces are all 1.25", so Skywatcher provides an adapter. The adapter can go straight into the focuser tube, or there is another 2" piece that can go into the focuser tube and the 1.25" adapter can then go into that. Not sure what the right setup is. I'm using my largest diameter eyepiece (32mm), but I get the same view of nothingness no matter what eyepiece I use. I've attached a photo of all the pieces as well as the focuser tube.
Thank you all for your help. Right now, the telescope is just a piece of furniture... hopefully you'll be able to guide me to actually seeing the night sky!