I had to load the drivers as the Mac default settings didn't include photo size or quality options.
But since doing so it only connects using a cable. The computer is 2011 but recently rebooked to high Sierra, and the printer is 2012 HP Photosmart 5515 (5510d version).
Any ideas what else I can do to be able to use the WiFi/ remote printing (Eprint I think it's called)? I'm a bit at all loss here.
I've been to HP website and downloaded latest drivers (no change).