How do i make robloxians walk 10 speed or slower?

If you mean the Walkspeed of a Player, then;

game.Players.PlayerAdded:connect(function(plr)
plr.CharacterAdded:connect(function(char)
char:FindFirstChild("Humanoid").WalkSpeed=NUMBERHERE
end) end)

I hope this helped! ;)

game.Players.PlayerAdded:connect(function(Player)-- WHEN PLAYER JOINS
Player.CharacterAdded:connect(function(character)-- when there character gets added
character:FindFirstChild("Humanoid").WalkSpeed = 10 --Gets there humanoid and set there walkspeed to 10

end)
end)

If you have any problems comment below. If I helped Upvote me please