See How Changing a Password Is Not That Hard? You can utilise the online management interface to modify the password and log out the unauthorised users who are causing the network to lag. There is a default username and password associated with your extension. Despite the fact that you can quickly adjust the settings by going to the login page. You will definitely have no trouble accessing the Linksys extender login page and configuring it in a straightforward manner. Consequently, enter the website address, such as extender.linksys.com, into the browser's search bar to obtain the router's username and password. Once you select Administration, you will be able to access the advanced options. When you discover  the administration option, you will find the option to set the password. Type the old one and then renew the password. Select the saved settings to reset the Linksys RE6500 Setup.