How to Unbind default Key Bindings...

WoW activates several Key Bindings by default. To “unbind” any of these, simply follow these steps:

  1. Open the Game Menu and click the "Key Bindings" button: Game Menu
  2. Select the binding that you wish to "unbind" and click the "Unbind Key" button: Default Keybinding
  3. Notice that the original binding is removed, and that the action is "Not Bound" anymore: Unbind Completed Successfully

Cheers! ???