OK, here's a simplest possible solution to control this thing from outside world.

1. Configure the plug to work in your home wi-fi network
2. Note the IP of the plug, SSH to that IP (under Windows - use Putty)
2.1. login = root, password = admin
2.2. mkdir /www/cgi-bin
2.3. do not close putty window!
3. Use any SCP-enabled file manager to upload the script to device (I prefer FAR Manager), you should copy "relay.cgi" to /www/cgi-bin/
4. In putty window, type "chmod +x /www/cgi-bin/relay.cgi"
5. Go to web browser and type:
5.1. http://192.168.1.XXX/cgi-bin/relay.cgi?state - to get current plug's state
5.2. http://192.168.1.XXX/cgi-bin/relay.cgi?on - to turn it on
5.3. http://192.168.1.XXX/cgi-bin/relay.cgi?off - to turn it off

The simple CGI script: https://drive.google.com/file/d/0B5b-Nf9ejjCKa3FtVG9MdzVQa3c/edit?usp=sharing
Shared publiclyView activity