You need to check the camera configuration options, because these apps will use those credentials to connect to cameras. You can either connect the camera directly to your PC to configure it or use the remote configuration method by typing its IP in the address bar on your browser. If you haven't configured the camera, then you should use its manual to see what are the default username and password. Based on that, you access and configure the camera then add it to the DVR software with all the credentials.