@mna20du3a 

Hi, It is suggested to refer to the reply here:

https://community.tp-link.com/en/home/forum/topic/617838?replyId=1236270

I believe you are talking about the web UI login password.

Device login password on the Tether APP or http://tplinkrepeater.net: the default is admin and sometimes it also asked you to customize your own username the first time to set up the extenders. It would be reset via a factory reset on the extenders by holding the reset pinhole for 10s.

Best regards.