I'm not sure what you mean by it just shows you a preview, but if you select a theme in your presentation tab section of your wordpress install, it will then become the active theme for your site.
If you mean that you are wanting to add a new theme to your site, then visit this question as I have answered that part:
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I'm not sure what you mean by it just shows you a preview, but if you select a theme in your presentation tab section of your wordpress install, it will then become the active theme for your site.
If you mean that you are wanting to add a new theme to your site, then visit this question as I have answered that part:
http://answers.yahoo.com/question/index;_ylt=AjNhf...
Or, if I can be of further assistance, visit my site and use my contact form to get in touch with more details.
http://www.templatemonster.com/support.php?PHPSESS...
This link will tell you how to do this. Plus you can ask one of your friends there to help explain it to you