$w is where the world name will go -- only the first instance of it will be replaced. You can also use special symbols (such as block text), but you won't be able to see them in your browser while editing. They will, however, show up in-game.
You might see some CRLF related issues (when you paste into user macros in game, it copies all into one line) - that is typically the case on some OSes/some browsers. If that's the case for you, try ctrl+c and ctrl+v into the game instead of using the button, or try using a different browser.
Made by Lychee Boba of Seraph. Reach out directly in-game or via the Faloop Discord for issues or updates, maybe feature requests if I feel like it. FFXIV, Final Fantasy, and all Data Center/World names are registered trademark of SquareEnix.