I can customice my 404 error when i access to sub-categories?

Are you using a WordPress site?

No, i use Simple Machines Forum, i want to redirect all 404 errors to my site home

Could I have the URL please?

Unfortunately I’m not to knowledgeable with SMF. But you can do the same thing with WordPress and it’s a lot easier to set up redirects.

I do not want to create a wordpress, I just want to modify the page 404 errors

Like I said, I don’t know how to do it with SMF. Sorry

This is not dependent on SMF; This depends on the hosting

You need to FTP into your website and find your .htaccess file

Make a backup of the .htaccess file.

Ok, thanks a lot!! -

Edit your original .htaccess file and add this line

ErrorDocument 404 http://www.domain.com/404page.html