As talgaby just explained:
If it is a Steam key or a Humble Bundle bundle (not store) gift link, then yes.
Otherwise, no, you have to make direct contact in Steam or through email.
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There is also an area that says "modify" where you could put a humble gift link or a Steam key. Otherwise, you can send a Steam gift directly through email or by contacting through Steam (which you have already attempted).
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is there way to send the winner the gift though the site
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