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When it comes to electronics, the majority of people just want to plug it in and see it work... and if it does, they're done. Since most wifi routers come set to default unsecured settings, that's what most people set up.
It isn't until they are advised to secure their network to protect their service, or after a nearby user maxes out their bandwidth, that many people will secure their network... and I suspect many of them have their ISP do the work or talk them through it, so they don't know too well how it works.
Pshrynk, what you have to do in a nutshell is to input a reasonably secure password for your wifi router, and set up your computers to use that password when accessing the net through the router. The details, however, depend on your service and equipment, so I cannot give you much more than that.
If your ISP provided the equipment, they can help... and the router's instruction book should also be able to talk you through it. Most Geek Squad-type services will be able to help you with that, too.
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