I've been trying to set up my page size to inches and all of that. I went through Library<Preferences<Adobe Systems and nothing about InDesign showed. I went through all of the other options but nothing showed.
Why are you looking there?
Set the units and increments in your InDesign preferences.
I can't get to preferences in InDesign. Preferences doesn't show up under Edit
On a Mac it's under the InDesign CC menu.