server problems 403, file not found

[shawn_a]

The for action is hardcoded to <form class="largeform" id="editform" action="changedata.php" method="post" accept-charset="utf-8" > So that is probably not the problem.

maybe you have some htaccess rewrite, make sure you didnt put a htaccess in the wrong place. try a fresh install confirm working, copy over it to complete, that is the recommended method of moving stuff. make sure you change your site url properly. check health check also.

Does your change actually get saved? Could be the redirect failing, cant really tell the error doesn't say the full url.