Collection of my modding guides for braid. All of them will refer to your braid's installation folder as Braid/.
..excuse my bad english..
Please note that existing tutorials usually only tell you how to start. This collection of guides tries to be better and complete version of those.
https://www.reddit.com/r/braid/comments/1da1bo4/how_to_get_the_level_editor_working_in_2024/ - Everything from accessing editor to packaging your mod.
https://www.moddb.com/games/braid/tutorials/accessing-braids-editor-and-loading-mods - Editor hotkeys.
https://www.moddb.com/games/braid/tutorials/braid-editor-universe-tools - Accessing editor.
You should be able to navigate files via github. I suggest starting here: LaunchArguments