Go through the following steps to change the Linksys RE6300 range extender administrator password. Launch your web browser and access the http//extender.linksys.com RE6300 web based setup page. Next, type your range extender's default admin password and click Login. Then, go to the Management option and type the new administrator password. Re-enter the Extender password to confirm and tap on the Save button. The administrator password of your Linksys RE6300 range extender is now changed.