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https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=232365177
I'm not sure if that's available for OSX or not. If not, you won't be able to create a mod (unless you use Bootcamp to run Windows and do it that way).
After downloading the Development Kit, you can double click on it in Steam to launch the Unreal Frontend application that will allow you run the Unreal Engine editor (to create new maps) and the Unreal Script compiler (which will allow you to create new mutators using script code).
You'll have to search the internets for tutorials on using Unreal to create maps or mutators. The Epic Games UDK forums is a great place to search for information about how to create mods...
https://forums.epicgames.com/forums/366-UDK
http://support.apple.com/en-us/HT201258
...but you will need a licensed copy of a Windows DVD to install Windows (so that's not free).