How do I change the DevComputerMovementMode of a player to Scriptable?

This is in a local script.

I used:

player.DevComputerMovementMode = Enum.DevComputerMovementMode.Scriptable

but it gave me this error:

10:01:28.868 - Insufficent permissions to set DevComputerMovementMode

10:01:28.869 - The current identity (2) cannot setDevComputerMovementMode (lacking permission 5)

How do I fix it? I did exactly what the wiki says to do.

That error means that only plugins can change the setting. You could manually change the property from StarterPlayer, but otherwise you can't change that property in game. There is a dev forum post on all of the permissions if you want to read up more about it.