Omega theme meta tag problem on Google
I'm afraid that's not really your decision to make...Google will take what it feels is the best representation of your site's description, whether that be the meta description tag or some text from elsewhere in the body.

The best you can do is make sure that you have &lt;meta name="robots" content="noodp"&gt;   (which Google supports) somewhere in the document &lt;head&gt;. That will at least mean your title/description will come from somewhere in your page source, and not from the Open Directory Project (which is a distinct possibility otherwise).

The most important thing...don't expect instant results. Google will revisit your site when it's ready, and there's still no guarantee it will use exactly the text you want it to for the SERP description.

If you're not happy with that outcome, contact an SEO specialist who might be able to point you in the right direction.