I am newbie in Magento development. I want to remove "Have no fear, help is near! There are many ways you can get back on track with Magento Demo Store." from 404 error page in my site. How can I remove the line from the site and adding custom content to that page ?
The 404 page is a simple CMS page. Go to
CMS->Pages in your admin panel, look for the 404 page and edit it.
The default 404 page title is
404 Not Found.