Hi  @NashimulWiFi,

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 TP-Link ID password.
    1. Open the Tether app and select "Forget Password" on the login screen.
    2. Enter the email linked to your TP-Link ID and click "Reset Password," prompting a password reset email to be sent to you.
    3. Locate the email in your inbox, open it, and follow the steps to set a new password.
Scenario Three: 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.
If you're still encountering problems, please contact us with the outcomes of these troubleshooting steps and provide more details so we can assist you more effectively.