Can't give away Steam game without store page

Support.

Give it on the forums instead, some games are not on the list for some reasons. Are you sure it's Steam? I only see Desura options for DRM on the site.

It isn`t on steam yet, so nobody could buy it for steam, so nobody can give it away for steam here....no Problem found. see?

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Every entry needs a fee and without a price, SG can't determine what it should be.

If it doesn't have a store page, you'll need to contact support as others have stated.

Just wait. As now you can't even know if the winner activates or regift/sell the game