I did an install and then discovered that I did not have the add-on. During this install HASS automatically detected 4 of my devices, including my HP printer and I was able to activate/set it up.
As I wanted the addons, I blew the installation away and started again with a supervised install on debian. This time round it only detected three of my devices; not the HP printer.
How do I get it to try and scan again to find it? Or how do I add the printer.