@Pratiksmh 

Hi, thank you for posting on TP-Link Community.

I assume you are able to login the Tether App but unable to login the router, right? For the router login password, it is the same as the one used to login web interface, but not the wireless password. If you don't remember it, please try admin in lower case.

However, if admin doesn't work and no other possible password, please reset your TP-Link device to default settings by pressing and holding the reset button for 10s.

Please note that all the configurations will be cleared after the factory reset, you will need to set up the router again.