Adding Windows Forms in existing UWP App -- 2

Hi, I have a small task that is needed to be done asap. I have existing working Windows 10 UWP C# app. But I need to change and add few parameters using a form at a start of app. Let me know if you can in how much time? You will need to access my PC remotely and do coding as the project requires hardware that I have to test and debug. Looking Forward,