There are details of how to find the network in the third post in this thread http://www.tomshardware.co.uk/forum/28102-18-suppoort-setupwirless and that should guide you through the process of securing the network. Aim for at least the WPA level of security - WEP is not secure enough these days. Keep a note of the key you set up - you'll need it if anyone visits and you want to let them into the system.