How do I make a textbox GUI that needs a certain input for something to happen?

Greetings, CaptainAlien132. I am helping you regarding the topic, "How do I make a textbox GUI that needs a certain input for something to happen?"

First of all, there are numerous mistakes in your code. Here is how to write a better codes.

1) It is better to write code inside the main function, not in an if statement.

2) Gui BackgroundColor3 takes Color3.new(value/255, value/255, value/255)

3) Indentation is required to make the code look neater.

4) Playing a sound is :Play(), not .Play()

5) Declaring variables always makes life easier. Rather than saying if code == "Name then" and so on, you could say, if code = codeValue thento make life easier.

6) not is used to check if the value is else. For ex, if text not= TextValue then

Here is the following code.

-- Declaration Section 

local player = game:GetService("Players").LocalPlayer
local playerGui = player.PlayerGui
local enterName = playerGui.MainGui.Frame.EnterName
local goButton = playerGui.MainGui.Frame.Go
local targetMessage = "CaptainAlien132"
local debounce = false 
local confirmed = playerGui.MainGui.Frame.Confirmed -- Not too sure if this works
local denied = playerGui.MainGui.Frame.Denied -- Same as above
local confirmedColour = Color3.new(204/255, 255/255, 204/255)
local deniedColour = Color3.new(255/255, 89/255, 89/255)
local regularColour = Color3.new(54/255, 81/255, 81/255)

-- Processing Section 

local function changeNames()
    if enterName.Text == targetMessage then 
        if debounce then return end 
        debounce = true 
            enterName.BackgroundColor3 = confirmedColour
            enterName.Text = "Correct!"
            confirmed:Play()
            wait(1)
            enterName.Text = "Enter name Here"
            enterName.BackgroundColor3 = regularColour
        debounce = false 
    else
        if debounce then return end 
        debounce = true 
            for number = 0, 2, 1 do
                enterName.BackgroundColor3 = deniedColour
                wait(0.15)
                enterName.BackgroundColor3 = regularColour
                wait(0.15)
                print (number)
            end
            denied:Play()
            wait()
            enterName.BackgroundColor3 = regularColour
        debounce = false        
    end
end

-- Output Section

goButton.MouseButton1Down:Connect(changeNames)

This is the link of the Hierarchy chart if you are unsure where all the variables are

If this helped, mark it as answered. Have a lovely day of coding!