password is set in the router. and for more secure u can even hide your ssid

Once u logged in the router via user / pass, u may find multi-tab conf tool that has one tab called ‘security’. Clicking on the tab it shows password as an selection. After click on that there is an option of wep / wpa. My suggestion is u have to choose ‘wpa / wpa2′ & use a long pass for more and strong security. Here r 2 more links which is based on XP (Assuming, cause u did not mention OS)….. Update and patch 4 wi-fi from MS.

…and for more secure u can even hide your ssid

Evidence should be provided to support hiding a SSID. Microsoft warns against it — Why Non-broadcast Networks are not a Security Feature. A Wikipedia article gives some general discussion and provides some extra links — Security gains of SSID hiding.

In general, it does not secure the wireless connection. It simply makes it a little harder for a casual neighbor to use your connection. Anyone who wants the SSID can get it. The SSID is broadcast whether you hide it or not; it has to be. The client will broadcast it when it needs to connect.

A strong password and encryption are the proper security measures, both on your network access and on your equipment.

Tom