Its supposed to change your speed to 21 if your in a group, doesn't work, help?
function onPlayerEntered(newPlayer)
if game.Players[newPlayer.Parent.Name]:IsInGroup(950346) == true then
newPlayer.Character.Humanoid.WalkSpeed = 21
end
end
game.Players.PlayerAdded:connect(onPlayerEntered)
Would this work?

4 comments
What is "human"
" == true" is not neccessary. "if" checks if the the statement between "if" and "then" is true. And yeah, what is "human"?
Would it work now that I changed human to newPlayer?
Try testing it