Hi @Ak_madhavi4,

Thank you for contacting our community.

May I know what is the operation mode did you select?

There are different passwords associated with the TP-Link wireless routers. If you've forgotten any of them, consider the following scenarios: 
Scenario One: Forgot the login password to manage the router.
    1. Try the default login password on the router's bottom label, which is often "admin".
    2. Perform a hard reset on the router by pressing the reset button until all the lights flash briefly. 

Scenario Two: Forgot the Wi-Fi password for the router.
    1. Check the bottom label of the router for the default Wi-Fi password, which is typically an 8-digit number. 
    2. Open the Tether App, log into the router under Devices, and navigate to Network > Wi-Fi Settings or Tools > Wireless to view the Wi-Fi password. 
    3. Connect your computer to the router via Ethernet, access tplinkwifi.net, and find the password under Wireless or Advanced > Wireless > Wireless Settings. 
    4. If all else fails, reset the router and use the default Wi-Fi password to reconnect. 
Note: A hard reset will restore the router to the factory default state without Internet access. You'll need to reconfigure it again.