This is what I do:

on the top part expand "key maps" and click on General. The bottom left section will show you "General" with expanded "Mapped Keys". Right-click on "Mapped Keys" and click "New Mapped Key".

Now click on the newly formed "New Mapped Key" and click the "hotkey" section on the right hand side to choose a key you want to press (let's say Num1). Also select whether you want FTL to apply to this mapped key (under "World of Warcraft: Use FTL Modifiers")

go back to the left-hand-side and right- click on 1 (below "Steps"). Now select "Keystroke Actions->New Keystroke action"

Under "Target" select which windows will receive the command

Under "Key Combination "select what the windows will receive (I.e. if your macro is on Num1, press Num1).

Save, Export to Innerspace, Bob's your uncle.

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