You can change the password for your wireless router by entering its IP address in a web browser and navigating to the password option in the administration panel. The password's location varies depending on the router's manufacturer.
It is a best practice to change the password when first setting up the router, as default passwords are freely available online, and leaving them set as the default represents a security risk. Wireless routers have two different passwords – an administrative password to change the router's settings and an SSID for Internet access over its wireless radio.
To change the administrative password, enter the router's IP address in your web browser. You will be prompted for a username and password, which is found in the router's instruction manual. When the administration panel loads, there is an option under the router settings to set the administrative password. Type in the new password and hit OK to update the router's password.
You can change the password for wireless access from the administrator panel as well. Proceed into the panel's wireless settings and enter in a new SSID. You can also select an option for wireless encryption, with WPA2 providing the strongest security. Enter a new password and hit OK to update the wireless access settings.
If you have lost the administrative password, you need to reset the router to the factory default settings. Instructions for doing so are in the router's manual.