A user can change the default login password of the Linksys extender using the web setup page. The first time a user interacts with the web interface of the Linksys extender, he has to type the default password on the required field. The default login password of the extender.linksys.com login window is "admin". A user is recommended to frequently changing the extender password for security purposes.
https://linksys-extendersetup.net