i am very sorry you neeed to edit the file post_message.asp
find this part
'If we are to show who edit the post and time then contantinet it to the end of the message
If blnShowEditUser Then
strMessage = strMessage &
"<edited><editID>" & strLoggedInUsername &
"</editID><editDate>" & CDbl(now()) &
"</editDate></edited>"
End If
and change for the below
'If we are to show who edit the post and time then contantinet it to the end of the message
If blnShowEditUser AND NOT
(ingLoggedInUserID = 1 OR blnAdmin = True) Then
strMessage = strMessage & "<edited><editID>"
& strLoggedInUsername & "</editID><editDate>" &
CDbl(now()) & "</editDate></edited>"
End If