By turning your hotspot device on, connect it to your laptop or mobile or any device.
Open any browser you like and log into your account using administrator as user name as well as for password.
Redirect to the dashboard and select option entitled as NETWORK
After selecting NETWORK, more options will appear, and you must choose Wi-Fi configuration>Network SSID.
At the end click on password option and you can now change your password and user name easily here.