i know now how :) blal,
you remove this code from templates/admin/setting.tpl
and you will not be able to change the password :lol:
Code:
<tr class="tablerow1">
<td width="40%">Admin Email</td>
<td><input name='admin_email' value='{$admin_email}' size="40"></td>
</tr>
it's working for me