Meta tags are used by search engines to allow them to more accurately list your site in their indexes. Sites such as geourl require you to add <meta> tags to your site. Regardless of why you want to specify the meta tags, this quick tutorial will show you what to do.
Login to your administration interface, and go to the Settings tab and click on the Site Options(15) icon.
This will pop up a window of options, click the second Tab Head, to add in your metatags.

Please notice that you do not have to put in the <head> </head> tags, blog-city will take care of all of that for you. Just click Ok to save the head information.
If you want to verify that the meta tags are indeed working, just visit your blog using your favourite browser. Since meta tags are not visible elements of your site, you'll need to look at the HTML source code for that page. If you're using Internet Explorer right click inside the page and choose 'View Source'. Between the <head> </head> elements you should see your meta tags. For example:
<head><meta name="DC.title" content="support.blog-city.com"></head>