Does anyone know how to make the text changeable during the game?

How to make it so that the players can change the text to sign, can you tell me how to do it?

What do you mean by that?

A TextButton that lets the players edit a billboard text?

@Valkyrop That’s probably what they meant

the most basic way would be to change the text property to what the player typed in.
Though to not break the Terms of Service you would need to filter the text if the written text goes global.

Here is a redirect for filtering: Text and Chat Filtering
And here is the API for the text label if you use that for the sign text: TextLabel