You are very smart !
To edit anything you need Visual Studio or any other compiler you prefer then you have to do the following
1- Open the project .sln or .cproj in Visual Studio
2- Navigate to the part you want to edit
3- Edit what you want
4- Build the project
5- Run the server and enjoy your edited thing
And i doubt you can do what i told you to... because it seems you have 0 knowledge about c#
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Editing the .cs file using a notepad actually did not affect your Server for the reason you are editing your project not the .exe [launcher]