best to do this while connected using a ethernet cable and i believe the default password/username for your router is:
username:guest
Password:guest
open internet explorer and log in to the router via
http://192.168.1.1 enter name and password. Click the WAN set up tab at the side and check that you have used Dynamic IP User when you set it up. if not, change it to Dynamic IP and the click the save box at the top. Click Wireless tab and make sure the Disabled Wireless box is NOT checked, Type a name in the SSID box(this will be the name you see when you search for wireless networks from your laptop) and in the Broadcast SSID box check Enabled, click save. Click the security tab at the top and in the Authentication Type drop down box choose WPA then in the KEY box make up a password of between 8 and 63 characters, click save. Then click the MISC tab scroll down and click the restart system tab.
disconnect the ethernet lead and on your laptop make sure your wireless network connection is switched on in the laptop you should then get a wireless networks available box, view networks, click the one you have just named and enter the password you should now be connected open Internet Explorer you should now be online, when you next start your laptop it should automaticaly connect to your network.