Hello@NFHFHFGH ,

Welcome to our community.

May I know what the model number of your device is? 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

The laptop's network key usually refers to the Wireless Network password. If you have already set up the extender, please keep in mind that its wireless password is the same as the router's.

So you can input the wireless password of the router. Alternatively, you can check the wireless settings on the Tether App:

• Open Tether app.
• Tap on the extender to log in. If prompted the password would be admin or the new password you have created.
• Tap on the Network Name.

Best Regards.