Go to WebAssist -> Forms -> HTMLEditor -> Site Settings. Make sure the upload directory is set to files. make sure the localhost connection is selected.
on the security tab, make sure the Administrator account is used for the Allow Access to option, and set the failed redirect to the admin/users_login.php page.
On the insert and update pages:
Delete the existing HTML Editor instance on the page, then insert a new one using html editor 3.
Set the name of the instance to "ContentValue".
On the insert page, the default value should be left blank. On the update page, paste this to the default value:
<?php echo(($totalRows_HistoryUpdate > 0)?((isset($_POST['ContentValue']) && $row_HistoryUpdate['HistoryValue'] != $_POST['ContentValue'])?$row_WADAContents['ContentValue']:$row_HistoryUpdate['HistoryValue']):$row_WADAContents['ContentValue']); ?>