how to change sender name with facebook api

hi I use facebook application and I want send feed message to page wall

$accesstokens = 'blalbalba';
$post =  array(
        'access_token' => $accesstokens,
        'message' => 'This message auto created - ' . date('d/m/Y H:i:s')
    );

I try everythin from , to ,user

I try graph api explorer

when I try send message with token

facebook api add extra this code to message

"application": {
    "name": "Application name", 
    "namespace": "application_namespace", 
    "id": "app id"
  },

but I try send message normally from facebook and this code not in there only adding this code try facebook api

and I see the application name on wall message "Share by Application"

How I change this ? I create page and when I try send message with facebook api and I sending message but I dont want see application name on my page wall