Vital,
The key you need to press is the Enter key. Is that what you mean when you say the "<-" key? I'ts the one immediately below the Del key.
Also, be sure you are not highlighting the word. The cursor should appear as a thin vertical bar, to the left of the word. It should not extend over the entire word.
The only other thing to keep in mind is that it could take a couple of seconds before the full definition appears - possibly as long as four seconds. That might not sound much, but it could be long enough to make you think that nothing is happening.
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