To control the uTrack24 using your computer, you would need to download and run the uRemote application on your computer.
uRemote works over the network. You can connect the Laptop directly to the uTrack24 using the network connector or connect both the computer and the uTrack24 to a router.
There is also a possibility to start playback using a footswitch connected to the front panel of the uTrack24.
Further info is available in the manuals which can be downloaded from https://cymaticaudio.com/downloads
Hope this helps.