How can I make a GUI that allows custom walkspeed?

I am making a GUI and want to make a textbox to choose walkspeed

My script is game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = script.Parent.Text

Here's a view of studio: https://vgy.me/bZsqjk.png

The text of the TextBox is a string (text). You cannot just set it as the WalkSpeed. You need to turn the text into a number with a function called tonumber().

hum.WalkSpeed = tonumber(script.Parent.Text)

Note that this function returns nil if the number is invalid, so you may want to use a ternary statement like this, in order to prevent unnecessary errors:

hum.WalkSpeed = tonumber(script.Parent.Text) or hum.WalkSpeed

That way if tonumber() returns nil, it will set the WalkSpeed to the current WalkSpeed (so it will be like it has never changed)

game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = tonumber(script.Parent.Text) did not work