@9421008373 

Hello, do you mean you want to change the wireless security password of your network? I'm afraid you need to change it on your wireless router instead and reset the range extender. If you don't know how to change it on the router, please contact your router support for some help.

Here is the guide to reset the range extender after you change your wireless password:

https://www.tp-link.com/support/faq/1411/