custom 404 "page_not_found" page

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Hello,
What is the easiest way make custom 404 "page_not_found" page"?
Theme does not contain a custom error page.

Error page should include a wallpaper, text and a search function.

 
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
If you want your page_not_found to be styled as a theme page.
Find the application/config/app.php file and add this code...
An example if using the elemental theme
<?php
return array(
    'theme_paths'         => array(
        '/login'            => 'elemental',
        '/register'            => 'elemental',
        '/page_not_found'            => 'elemental'
    ),
);
Usernhfdy73 replied on at Permalink Reply
thanks for answering

okay, I added that.
what next? i can't still edit page_not_found page.
ConcreteOwl replied on at Permalink Best Answer Reply
ConcreteOwl
The page_not_found.php file can be found in the concrete/single-pages folder.
If you want to add more editable areas to it, you should first copy the file to the application/single-pages folder and then open it in your favourite editor and all the extra editable areas that you require.