How do I change the text of a label using a button?

Explanation

This is a really easy and simple question. Make sure that the script is a local script else this script won't work and can possibly bring errors..

Solution

local Button = script.Parent  -- Define the Textbutton
local Label = game.StarterGui.ScoreboardGui.Scoreboard.Main.Home.Main.TeamName 

Button.MouseButton1Click:Connect(function()
    label.Text = "Hi" -- Change Hello to what you want the text to be..
end)

Example 2

local Button = script.Parent -- Define the Textbutton
local Label = game.StarterGui.ScoreboardGui.Scoreboard.Main.Home.Main.TeamName  

Button.MouseButton1Click:Connect(function()
    label.Text = "This is a local script"    -- -- Change **This is a local script** to what you want the text to be..
        wait(2) 
       label.Text = "Hello"  -- Change **Hello** to your own text if you would like to..
end)

I also recommend you adding variables..

Example 3

local Button = script.Parent -- Define the Textbutton
local label = game.StarterGui.ScoreboardGui.Scoreboard.Main.Home.Main.TeamName 

Button.MouseButton1Click:Connect(function()
    label.Text = "Hello"
       label.TextColor3 = Color3.new(255,0,0) -- 255,0,0 is a red color..
end)

I hope this helps you and please up vote and select this as your answer if it did so..