Unfortunately as far as I know Google doesn't allow manual editing of the sitelinks that appear. I believe they show based on popularity what they think is the best results.
The only thing admin to the site can do is demote sitelinks they don't like via Google Webmaster Tools. Building a XML sitemap and submitting it via Webmaster Tools can also be helpful but doesn't guarantee any results.
Lot of truth here. There's only so much you can do with Google.
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