To save and edit the interface, have these variables somewhere in your code.
local SaveManager = loadstring(game:HttpGet("https://raw.githubusercontent.com/1dontgiveaf/Fluent/main/Addons/SaveManager.lua"))()
local InterfaceManager = loadstring(game:HttpGet("https://raw.githubusercontent.com/1dontgiveaf/Fluent/main/Addons/InterfaceManager.lua"))()
To use this though, pass your script to our managers.