WPA and WPA2 are good enough to keep 99% of home wireless networks secure. Recently there have been reports of flaws in WPA, but they are theoretical and very unlikely to matter unless someone wants into your network traffic badly.
There you are, two simple steps to keep your private network private. There are many different manufacturers, and each will have slightly different steps to making these changes. A quick trip to your help menu or manufacturer's website should help you make necessary changes and keep you safely surfing from the couch.