I had the same problem, and I was given those directions. However, on the same menu where you see the grayed out "Add a printer", at the bottom right there should be a drop down box, and you can select CUPS from there. Then you're good to go
If you don't find it exactly where I said, it should be right around there, I'm out of town, so I'm having to go off of my memory, which isn't that great lol
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