Topic on Talk:Trolley Dilemma
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I'm assuming you mean the description, but I think that's meant to be interpreted as "one of the quick slot keys", as it's saying to press a key from the quick slot keys.
That being said, I will confess that the wording can be a little confusing (even I was slightly uncertain of what it meant before the images were uploaded), but the tip doesn't really do anything to clear it up.