Where does wp_redirect need to be placed to make it work?

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Once you’re in the template it’s too late, as headers have already been sent. You have to hook earlier in the request to check, like the template redirect hook:

add_action( 'template_redirect', 'wpse52455_redirect' );

function wpse52455_redirect(){
    // do your check and call wp_redirect here
}

Note that this will get called on every request, so you also need to do a check that the current page is your edit page.

EDIT – the above code should go in your theme’s functions.php file.

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