Hello   @Sujal123kumar 

To change the Wi-Fi password for your access point, you could try to log in the Access Point as instruction here and go to Wireless settings to change the password. 
https://www.tp-link.com/support/faq/1602/

If you do not remember the login password of the access point, try performing a factory reset for the AP, and the Wifi password will become the default 8 digit wifi password on the label. 

Reset: With the access point powered on, use a pin to press and hold the Reset button until the Power LED starts blinking, then release the button.