Password protect settings apple base station?

Hi I have a base station for my wifi connection but have allowed a friend access to it to use the web...
I would like to know how to password protect it to stop them playing around with settings, is this possible?

If so how is it done?

Thanks

That's the first thing it asks you for during the initial setup. Do you not have to enter a password when you log in to it?

If not, open up Airport Utility and browse through the tabs to find where you set up the name and password for it.
Can't help much more atm, not at a Mac.