To change the password for your Zong 4G WiFi device, you'll need to access the device's administration interface. Here's a step-by-step guide to help you:

1. Connect to your Zong 4G WiFi device using a computer or mobile device. You can connect via Wi-Fi or using an Ethernet cable.

2. Open a web browser (such as Google Chrome, Mozilla Firefox, or Safari) and enter the default IP address for the Zong device in the address bar. The default IP address is usually "192.168.8.1" or "192.168.1.1". Press Enter to access the login page.

3. On the login page, enter the default username and password for your Zong device. The default username and password are typically "admin" or "administrator." If you've changed the login credentials in the past and can't remember them, you may need to reset the device to its factory settings.

4. Once logged in, you should see the administration interface for your Zong 4G WiFi device. Look for the "Settings" or "Wireless Settings" section.

5. Within the settings, locate the "Password" or "Security" option. The exact wording may vary depending on your device's firmware.

6. Click on the "Password" or "Security" option to access the password settings.

7. You should now see the current password field. Enter your desired new password in the appropriate field.

8. After entering the new password, click on the "Save" or "Apply" button to save the changes.

9. Wait for the device to apply the new settings. This process may take a few moments.

10. Once the changes are applied, your Zong 4G WiFi device will have a new password.

Remember to use a strong and unique password to secure your WiFi network. Avoid using easily guessable information, such as your name or address, and consider including a combination of uppercase and lowercase letters, numbers, and special characters.

If you encounter any difficulties during the process, it's recommended to consult the user manual provided with your Zong 4G WiFi device or reach out to Zong customer support for further assistance.