How to edit the header of exporlor

I want to edit the following content.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en"> <head> <title><https://www.zencart.com> title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <meta name="keywords" content="Handbags Jewelry ecommerce, open source, shop, online shopping " /> <meta name="description" content="www.xxx.com : - Handbags Jewelry ecommerce, open source, shop, online shopping" /> <meta http-equiv="imagetoolbar" content="no" /> <meta name="author" content="The Zen Cart™ Team and others" /> <meta name="generator" content="shopping cart program by Zen Cart™, <http://www.zen-cart.com> eCommerce" /> ....

so that pepole will see my website address from the web broser title, not zencart.com....

Do you know which file I can edit it.

Did you check includes/languages/english/meta_tags.php

You should really check includes/languages/english/YOUR_TEMPLATE/meta_tags.php