Text-based walkspeed script not working?

(Warning: This answer is too long. The answer is in the down, so if you lazy to read, just scroll to the downest!)

Hi there! It seems you like new to LUA, so I'll say it simple, and easy to learn, follow this step-by-step! Honestly, I was bad at English, so sorry for the grammars! :P

Before I start, I'll explain those 2 people's answers.

local a = '1'
print(type(a))--> string
a = tonumber(a);
print(type(a))--> number

local b = 'wow string!'
b = tonumber(b)
print(b) --> nil

Let make this become 2 parts, the up part, and the down part.

The up part:

local a = '1'
print(type(a))--> string
a = tonumber(a);
print(type(a))--> number

We're local the 'a' become 1. But the 'a' is a number, so change it to number. If we use string, it still works.

The down part:

local b = 'wow string!'
b = tonumber(b)
print(b) --> nil

The 'b' is not a number, so if you make it to number, it will become nil, definitely printed nothing out.

So we can know tonumber() is a thing that changes string to number!

Yeah, it's was already self-explanatory. Right?

Another one:

while true do wait()
    local player = game.Players:FindFirstChild(script.Parent.Text)
    if player ~= nil then
        player.Character.Humanoid.WalkSpeed = script.Parent.Parent.Speed.Text -- Speed is the other textbox where the player will input the new WalkSpeed of the player humanoid
    end
end

I don't support to use this script, because the while true do, it always updates the script in 0.000317 seconds. So it might cause lag, and another, player.Character.Humanoid.Walkspeed. Sorry, a Humanoid is not in the workspace, it appears if you run the game, so we must use WaitForChild(), wait for the child out. Yeah, it's funny if you read it.

If you mentioned why tonumber() and the WaitForChild() have a bracket, it just an ObjectValue. ObjectValue is a value which cast the object, it was not like the string, it was defined to an object.

So, I recommend to use this script:

Also, credit to AntoninFearless. I used his script.

while wait(.5) do -- update the script every 0.5 seconds.
    local player = game.Players:FindFirstChild(script.Parent.Text)
    if player ~= nil then
        player.Character:WaitForChild("Humanoid").WalkSpeed = script.Parent.Parent.Speed.Text -- Speed is the other textbox where the player will input the new WalkSpeed of the player humanoid
    end
end

Maybe this will work, I don't know, if it works, mark this as answer, and tell me below the comment, if it was incorrect, I'll try my best to find the problem, and fix it! If you have more questions, PM me in ROBLOX, and also cyaaaaaaaaa