How to Change a Linksys WPA
- 1). Open your browser and go to "192.168.1.1." This represents the IP address of your router. If you changed this address previously, go to the address you changed it to instead.
- 2). Write "admin" in both fields when you get a prompt asking you to log in. If this doesn't work, leave the username field blank and use "admin" as the password.
- 3). Go to the "Basic Wireless Settings" or "Basic Settings" link under "Wireless" in the main router configuration page.
- 4). Go to the field labeled "WPA Shared Key" and type whatever key you desire.
- 5). Click "Save Settings" near the bottom of the page.
- 6). Restart your router.
Source...