Assuming “player.Character.Humanoid” is valid, it would error as “Jumpspeed” isn’t a member of the humanoid. If you can verify player.Character.Humanoid exists (eg. switch to :WaitForChild instead of indexing with periods and use player.Character or player.CharacterAdded:Wait()), and you change Jumpspeed to a valid property (unless you’re creating a child of the humanoid called Jumpspeed), it should work, yes.
Ok thanks yeah the print(Player.Character.Humanoid.Jumpspeed) was just a replacement code I quickly typed up bcuz it was easier than entering the entire code for it.