artstar
crazybob answered your question, but you didn't realise it.
Install the free user manager contrib from dungog.
Then assuming your overseas office has a static IP, enter this in the remote access, remote management panel.
Configure user manager to allow users to change their password.
Entering 0.0.0.0 as suggested by santiagon is a BAD idea, as it opens your server manager to access by ANYONE, they just need to crack your password and they are in, it's just a matter of time.