Hi there! I'm sorry to hear that you're having trouble signing into Zangi Private Messenger. Let's work together to resolve this issue.

Could you please provide a bit more detail? For example, are you encountering any error messages when trying to sign in? Also, have you recently changed your password, or is this the first time you're trying to log in?

In the meantime, here are a few general steps you can try:

1. Check Your Internet Connection: Make sure your device is connected to the internet (Wi-Fi or mobile data) and try again.

2. Restart Your Device: Sometimes a simple reboot can solve various issues. Turn your phone off and back on.

3. Update the App: Ensure that you're using the latest version of Zangi. Go to the Google Play Store, search for Zangi Private Messenger, and check if an update is available.

4. Clear App Cache: Go to your phone’s Settings → Apps → Zangi → Storage → Clear Cache. This can help eliminate temporary glitches.

5. Check Login Credentials: Double-check that you're entering the correct email or phone number and password.

If none of these steps work, please let me know, and we can explore more advanced options together!