How to change short-edge binding on Mac in pages

Okay, so I know its not my printer because I can do it from my PCs. I am trying to change the presets in Pages. File>Print>Presets>Show Presets>Layout>Two Sided. Now right now it shows long edge binding, and I need to change it to short edge binding so my document prints correctly, but I cannot select any different options anywhere in this Show presets dialog. It won't let me change anything or even see the different options. I can check two sided and make changes in the File>Print menu, but its like I can't change any options in the Preset menu. I don't see a lock icon that shows up in Apple>Preferences. Can anyone help please?