Question: how can i change the password of my ptcl wifi?
Answer: Open your web browser and type 192.168. 1.1 or 192.168. ... 
You will be asked about the username and password. Type admin in both username and password field.
Click on wireless and then on Security. Look for the WPA/WAPI passphrase bar option.
Click on it and set a new password. Click on Apply to change PTCL WiFi password.