Setting up a wireless network using a 3Com router

Hello all,

I've set a wireless network in my home using a 3Com router.
I'm trying to change the network name (SSID) and to set a password using the broswer (after i entered an IP address to access the router's setting page) to make the network available only to me. After creating the necessary settings i press the "Save" button and then "Apply". The router now starts a countdown of 30 seconds until the setting become active (though it's weird that i can still browse the web during this time).
Yet, when i try to connect to the wireless network i see that the SSID hadn't change (default: 3Com) and that there is no password. Also, i'm not sure about the exact period of time, but when accessing the router's setting page again i see that nothing had been saved.

What do i have to do to *really* save my setting and restrict the access to my wireless network?

Thank a lot!