Hello@Royal-match ,

Welcome to our community.

What is the model number of your device? Please refer to:

How to find the model number of your TP-Link device 

How to find the hardware version on a TP-Link device

If you don't know the login password to manage the extender.  Please try:
    1. Try the default login password, which is often "admin".
    2. Perform a hard reset on the extender by pressing the reset button until the lights flash briefly. For most models, with the power on, you can reset the extender by pressing the reset button/hole for one second.