Connect your device to the TP-Link router Wi-Fi or via Ethernet
Open a web browser
Enter the router IP address in the address bar
Log in with the current admin username and password
Go to the System Tools or Administration section
Select Password or Account Management
Enter the current password
Enter the new password
Confirm the new password
Save or Apply the changes
Log in again using the new password
Update the Wi-Fi password separately if needed in the Wireless settings