In order to edit, make sure you're using Visual Studio Code.
To install roblox-ts, follow this tutorial.
It also helps to have these vscode extensions:
- https://marketplace.visualstudio.com/items?itemName=Nightrains.robloxlsp
- https://marketplace.visualstudio.com/items?itemName=Roblox-TS.vscode-roblox-ts
- https://marketplace.visualstudio.com/items?itemName=evaera.vscode-rojo
You also want these studio plugins:
- https://www.roblox.com/library/4048317704/Rojo-6 (if Rojo hasn't installed it automatically)
- https://www.roblox.com/library/5969291145/Roblox-LSP-Plugin