LiberatorAGMode/Liberator=I
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Where the letter I is the new key. (i'm using the core when i play terran.)
If you don't know where the hotkeys file is, its usually in libraries\documents\Starcraft II Beta\Accounts\+++++++++\Hotkeys\
Where the +++++++++++ is your account number.
If you are new, to open the file just right click on it and open with... then choose wordpad.
**This was posted orignally in a twitch chat by the twitch user Timelog
Hope this helps
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Here's a video for people that are confused.