>>>>>can you please tell me how I can edit this myself so that I can remap the shortkeys to new ones I want?

Please look at my post here:
https://macacad.wordpress.com/2010/12/20/edit-and-create-shortcuts-in-autocad-for-mac-yes-it-is-poss...

It was written at the times of AutoCAD 2011, but still useful as it explains basics of customization. Now (in 2018 version) both files you use for shortcut customization- AcceleratorRoot.cui and MenuGroup.cui - are inside "/Applications/Autodesk/AutoCAD 2018/AutoCAD 2018.app/Contents/Resources" folder.