How do I manually in game to turn players into R6 instead of R15?

Theres a setting that requires no Scripting. It forces the selected BodyType on all Users. You can find it in "Game", on the Banner in Studio.

Or, when you publish your game, there is an option called "Force R6."

I mean like, if I click a single button like a Gui and a Textbox which I know how to script how do I force that certain player to be R6?

Enum.HumanoidRigType.R6

@MC I tested that, except when you change the rigtype is breaks the humanoid so...

This website is not a website for requests

When you change the rig type, you would have to kill the Humanoid first (if I remember).