My router is saying it is unsecured, how do I fix this?

Hook your PC/Laptop up directly to your router, Get on the net and look up yourRouter , go to support and look to see if you can find the Router address. Copy and paste it into your web address bar in your search engine. It should bring you to a router setup page, and there should be a link to set up your security. Or use setup disk that came with it and use the setup wizard