1. Download and Install TVRMobile:
Find the TVRMobile app on your mobile device's app store (Google Play Store for Android, App Store for iOS).
Install the app.

2. Add Your NVR Device:
Open the TVRMobile app.
Tap the "Menu" button in the top left.
Tap "Devices": to enter the Device Management interface.
Tap the "+" icon: (or similar) to add a new device.
Choose "Manual Add" .
Give your NVR a name (Alias): (up to 16 alphanumeric characters).
Select a "Register Mode":
ezDDNS: If your NVR is registered with an ezDDNS server, enter the server address and device domain name.
IP/Domain: Manually enter the NVR's IP address or domain address.
Enter the username and password for your NVR.
Tap to confirm: the settings.

3. (Optional) Add Devices by Scanning QR Code:
In the Device Management interface, tap the "+" icon, then select "Scan QR Code".
Follow the on-screen instructions to scan the QR code on your NVR.

4. Configure Network Settings (if necessary):
Ensure your NVR is connected to the internet: via a wired connection (Ethernet cable) or a wireless connection (if supported). 
If using a wireless connection, ensure your NVR is connected to the same Wi-Fi network as your mobile device . 
If you're using a fixed IP address, ensure your NVR has a static IP address . 
If you're using DDNS, ensure your DDNS hostname is assigned to your NVR . 
If you're using port forwarding, ensure the necessary ports (default 80, 8000, 554) are forwarded on your router to the NVR's IP address.

5. Verify Connection:
After adding the device, you should be able to see the live video feed from your NVR in the TVRMobile app. 
If you encounter any issues, consult the TVRMobile user manual or your NVR's documentation for troubleshooting steps.