Customized 404 pages are also a great opportunity to provide some help to your users by linking them back to your blog, or give a few pointers on navigation.
You can find the option to create a customized 404 page
by going to Settings.
Search Preferences.
To enter your custom message,
click Edit to open the text box.
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| Custom page not found blogger setting tips |
<a href="http://yourblog.blogspot.com/" target="_top">How to Customize Your 404 File Not Found Page</a>