Would this be how i change player's walk speed without PlayerAdded?

So err what I'm trying to do is change all of the players walk speed at a certain point, and not player added/player enter. So like after 15 seconds all players walk speed changes. This is what i tried.. :

wait(15)
function (changespeed)
for v_in pairs, do
game.Players.Walkspeed = 0
end

changspeed()

I think it's really wrong that is why i need help :/

What you did wrong:

• You put the function's name in the wrong place, it goes outside of the parenthesis, not inside.
• You were attempting to loop through nothing - which would break your code.
• You were attempting to index game.Players as an individual player (it is actually the holder of individual players).
• The Walkspeed property is not inside the player, it is inside their Character's Humanoid.
• You attempted to call the function with the wrong name (you made a typo, changspeed was not the name defined, changespeed was).

Code:

wait(15)

function changeSpeed() -- the function's name is defined outside of the parenthesis
	for _,v in pairs (game.Players:GetPlayers()) do -- loops through a table of players
		local char = v.Character -- their character
		if char then -- if their character exists
			char:WaitForChild("Humanoid").Walkspeed = 0 -- Walkspeed may need to be 'WalkSpeed', I can't remember currently
		end
	end
end

changeSpeed()

Hope I helped!

~TDP