|Have you read the routers manual to figure out, whether there is a default WEP or WAP key?|
You first have to connect to the new router by wire, to configure it for your needs.
When connected by wire, simply open your web browser and type in the default ip address of the router (refer to the reouters manual), to connect to the web setup interface of your new router.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!