Connect your device to the TP-Link router Wi-Fi or use an Ethernet cable
Open a web browser
Enter the router IP address in the address bar
Log in with the router admin username and password
Go to Wireless or Wireless Settings
Open Wireless Security or Wi-Fi Password settings
Enter the new Wi-Fi password
Save or Apply the changes
Reconnect your devices using the new password
If you want to change the admin password, go to System Tools or Administration
Open Password or Account settings
Enter the current admin password
Enter the new admin password
Save or Apply the changes