how to install custom roms on note 3(at&t) using MacBook

You don't need Odin or a computer for that. Install a Custom recovery like TWRP or CWM and then install a Custom ROM
 
Or you could run VirtualBox and install Windows. It depends on whether the ROM comes as a zip or an Odin package. (You can convert between them, but it's a pain.)
 

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