Cannot map custom Keyboard Shortcut


I am new to IntelliJ. I am using the Community Edition 9.03. I am attempting to map a keyboard shortcut. I go to File -> Settings -> Keymap. I click on the Shortcut, but I see the buttons Add Keyboard Shortcut, Add Mouse Shortcut & Remove disabled.

Any idea how to enable these buttons so that I can change the Keyboard Shortcuts
Thanks a lot,

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