Go to the game’s directory and find: The Witcher 3/bin/config/base.
When in the base folder, open the general.ini file with Notepad or another text editor. Add a new line and paste the following text: DBGConsoleOn=true.
This will enable the developer debug console inside the game. You can open it in-game with the ~ button. You can then enter your commands there and submit them with the enter key.
Script Studio
Script Studio is the go-to tool for editing everything to do with scripts for The Witcher 3: The Wild Hunt.
The latest version of ScritpStudio is included in REDkit and can start it in the Tools section.
Script Studio will keep everything synced for you once you start a project.
You can check out files in the same manner as you do within REDkit.
Edit while the game is running
Script Studio allows you to place breakpoints in your code and hot reloads your code - which means you can change the code while the game is running in the Editor. Script Studio connects to the game automatically.