changing the welcome private message

[Siso010]

Hello.
I wanted to send a private message to my new user to welcome them in my forums,but i wasnt able to do it
it gives me this error

Forbidden
You don't have permission to access /vb/admincp/phrase.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request

can we fix this??
thanks alot in advance

[Speysider]

If the file phrase.php has 644 file permissions, then contact your host, they probably have mod_security enabled.