Step 1. First Need to connect your router with computer through Ethernet cable.

Step 2. Open the web browser and type 192.168.1.1 or myrouter.local into web browser.

Step 3. A Login Screen will open and Enter username and password.

Step 4. After Login Go to the Wireless Tab.

Step 5. Click the Wireless Security tab.

Step 6. Check Security Mode is WPA2 Personal.

Step 7. Change the Passphrase.

Step 8. Click the save Settings Button.

Step 9. Close the web browser Tab.

Step 10. Password is change Now Done Password change.