1. Make a folder called script_yourname inside Documents/BLockland/Add-ons
2. Create a .txt file called "description.txt" containing nothing in this folder.
3. Call your script server.cs (for server mod) or client.cs (for client mod) and put it in the folder.
4. (Re)start blockland.
Client mods do execute when you launch the game, server mods execute when you start a server with them enabled.