Tutorial:GUI/Reset GUI

First, open ROBLOX Studio by going to Start > All Programs > ROBLOX > ROBLOX Studio.
Secondly, go to My ROBLOX > Profile > Edit my place.
Once it is loaded, go to Insert > Object > ScreenGui.
Drag the new ScreenGui into the StarterGui node in the explorer.
Make sure the 'ShowDevelopmentGUI' checkbox is checked.
Now, go to Insert > Object > TextButton.
Move the TextButton into the ScreenGui you inserted before.
Set the TextButton's name and text properties to "Reset".
Set the TextButton's XAlignment property to "Center".
Set it's position to: {0, 0}, {0.5, -10}

The position is a UDim2 position. The first table is the X and the second table is the Y. In both tables, the first number is the scale. The scale is on a scale of 0-1. Halfway would be 0.5, Quarter-way would be 0.25. The second number is the offset. The offset on the Y table is -10 because I want the TextButton to be halfway on the Y axis take away 10 pixels.

Set it's size to: {0.1, 0}, {20, 0}
Set the BackgroundColor3 to any color you like.
Set the TextColor3 to any color you like (make sure it stands out from the background color.)
Now, go to Insert > Object > Script and move the script inside of the TextButton.
Double-click the script. Copy and paste this in:

local player = script.Parent.Parent.Parent.Parent -- Get the player
function onMouseClicked()
if player.Character ~= nil then -- If the player isn't respawning then
if player.Character:findFirstChild("Humanoid") then -- If we can find the player's humanoid then
player.Character.Humanoid:TakeDamage(100) -- Take away the player's health.
end
end
end

script.Parent.MouseButton1Down:connect(onMouseClicked) -- Connect to the onMouseClicked function when the button is pressed

Make sure everything is setup then try it out!

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