Why is it in my Materials window (actually named 'Colors/) I don’t have the Detalle icon in order to save, and create my own library of textures?
You don’t have the Details menu because that’s a Windows thing and you’re using Mac.It uses the Mac-supplied color manager. If you want to save that library of interesting colors, click on the List menu. Then click on Duplicate. Give the duplicate list of colors an appropriate name and click on OK.