How can I translate this into a script Lua will understand?

I hope this is clear enough but I would like for when users join the game their BodyHeightScale is set to 0.75.
If you help me with this thank you very much.

You could put this as a script in StarterCharacterScripts:

script.Parent:WaitForChild("Humanoid"):WaitForChild("BodyHeightScale").Value = .75
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You don’t need a script to do this – you can navigate to Game Settings > Avatar, then set the height scale.