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==Editing an Error 404 Page==
The default WordPress theme has a 404.php file, but not all Themes have their own custom 404 error template file.  If they do, it will be named tt404.php/tt.  WordPress will automatically use that page if a Page Not Found error occurs.  

The normal 404.php page shipped with your Theme will work, but does it say what you want it to say, and does it offer the kind of help you want it to offer?  If the answer is no, you will want to customize the message in the template file.

To edit your Theme's 404 error template file:
# Open your WordPress admin panel: 
# Choose Design menu. (Presentation pre 2.5)
# Choose the Theme Editor page. 
# Check to see if your theme includes a '404 Template' in the list of files.
# Click the link for '404 template' along the right side of the page. 
# Edit the message text to say what you want it to say.
# Save your changes. (If the template file is not writable, see [[Changing_File_Permissions|Changing File Permissions]].)

While you are examining and editing your 404 template file, take a look at the simple structure of the default tt404.php/tt file.  It basically features tags that display the header, sidebar, and footer, and also an area for your message:

pre?php get_header(); ?
   div id=content class=narrowcolumn
     h2 class=centerError 404 - Not Found/h2
	/div
?php get_sidebar(); ?
?php get_footer(); ?/pre

So, to change the error message your visitor sees, revise the text within the '''h2''' heading and if necessary, add more paragraphs below that.