From the Store description:

Use this simple app to control your digital camera remotely. Change basic exposure parameters, control shutter and download pictures to your Windows device.

Please note to use this app your camera needs to have Wi-Fi capability or that the camera is accessible on a TCP/IP network. And the camera supports PTP/IP over its network connection. Depends on how well the camera supports generic PTP/IP protocol, some features of this app may not be available. Additional support can be obtained by contacting us using the support email.

Setup with cameras that have Wi-Fi hosting capability:

Enable build-in Wi-Fi from your camera's configuration menu. If the camera is using a Wi-Fi adapter such as the WU-1a/1b, please follow the adapter's user instruction to setup the network. Search for the camera's Wi-Fi access point from your Windows device's Wi-Fi settings. From your Windows device, join the Wi-Fi network hosting by your camera Launch the app, and configure it to connection to the correct IP address and port. (default settings should work for Nikon cameras and a few others) Tap 'connect' to establish PTP/IP connection to your camera

Setup with cameras that connects to an existing network: