I can't raise the Wireless router

My wife, bless her, has changed the domestic broadband supplier and we've changed to their new router. After fixing problems at the BT phoneline exchange, the lan cables in the house work OK, but I can't sign in to the router. When I get to the window to type in the router key, the Dell just beeps and won't let me type.

The router is on Channel 9. I also notice an illuminated locked padlock on the Dell keyboard, bearing the number 9. Can't get it to go out.

And I can't track it down in the online manual.

Anyone else out there still using one of these laptops?

chris brown plymouth