Go To The Official Website https://visualstudio.microsoft.com/ And Then Press Download
In The Installer Choose .NET Desktop Development
Make Sure To Choose Windows Forms .NET
Make A UI With 2 Simple Buttons For Execute And Inject And A richtextbox
Choose x64 by right-clicking your project in the Solution Explorer and pressing Properties.
You Have To Have A Api Like Cxapi Or ForlornApi
Double Click On You're Button And That Will Open Up The Coding Tab Where You Can Add The Coding Logic