You will have to log into your wireless router's admin console to do this.
Open up your web browser and navigate to your router's address. This is usually
http://192.168.0.1. If that doesn't work, you'll have to replace that with your router's IP address. (
Here's how to get the router IP address - you want the address of the
Default Gateway.
You'll see a login page. If you don't know the login, try
admin as both username and password.
Click Wireless from the left menu.
Click the Security sub-menu (left menu again)
You should have WPA2 selected. Your wireless password is the
Passphrase. Change it to whatever you want and click apply.
To test, disconnect a computer from the wireless and try to reconnect. It should fail since the password has changed.
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