How do make my router secure when its states it unsecure

How to secure the wireless network

You want to secure the wireless network.
Is there any computer connected to the router with the Ethernet cable?
If not then you will need to connect the computer to the router with the cable.
Check the IP address on the computer. Open the router set up page.
Once you open the set up page, you will find the option to make it secured

Secure your linksys router wireless or access point administration interface linksys router wireless have an administrator password that's needed to log into the device and modify any configuration settings. Most devices use a weak default password like "password" or the manufacturer's name, and some don't have a default password at all. As soon as you set up a new WLAN router or access point, your first step should be to change the default password to something else. You may not use this password very often, so be sure to write it down in a safe place so you can refer to it if needed. Without it, the only way to access the linksys router wireless or access point may be to reset it to factory default settings which will wipe away any configuration changes you've made.
source:
http://www.linksysrouterwireless.com/article/Securing-your-wireless-network.php It'tell you about securing your wireless
source

You need to setup Encryption.

SETUP WPA2 ENCRYPTION ON YOUR ROUTER:

1. Connect the computer to one of the four LAN ports on the router.
2. Open a web browser on the computer.
3. In the address bar of the web browser, type http://192.168.2.1
4. Click Login in the upper right-hand corner of the page. The router does not ship with a password, so just click Submit.
5. Click on Security in the left-hand column under the Wireless heading.
6. Use the drop-down menu and select "WPA/WPA2-Personal (PSK)".
7. Select either WPA-PSK, WPA2-PSK, or WPA-PSK+WPA-PSK2 as your Authentication; doing this will set the Encryption Technique automatically.
8. Enter a word or group of characters in the password (PSK) box. The Pre-Shared Key must be 8 to 63 characters in length. Note: The PSK (Pre-Shared Key) is case-sensitive ("A" is different than "a").
9. Unchecking the Obscure PSK box will allow you to see the security key that has been typed.
10. Click the "Apply Changes" button to save the settings.

1. Select the network you want to access.
2. Click Connect.
3. In the dialog box that appears, type the WPA-Personal pass phrase in the Network Key and Confirm network key text boxes, then select the Connect option. The connection should be made automatically.