You’ll need the custom device type code for the sc7. There should be a thread dedicated to it with instructions for getting the code to work with the device. This SmartApp would help you create lighting scenes and assign them to one of the buttons, but you need the custom device type so ST will ewgister the button presses.
Here’s the FAQ on using custom code. It should help you understand how to get this SmartApp and the custom sc7 devicetype into your account.
Edited: here’s the thread for the sc7. Sorry it’s long and I couldn’t scan it for the most relevant posts. Usually the first one is updated with code links and general instructions.