How to redirect Blogger 404 Error (Page Not Found) to homepage

When a user goes to a nonexistent URL on your blog, Blogger will display this Error 404 (Page Not Found) message at the top of your blog post area: "Sorry, the page you were looking for in this blog does not exist." Hmm… probably not the best first impression you’d want to give a potential reader. Before  the user hits the Back button or closes the browser’s window/tab and disappears forever,