How can I make the frame visable?

You can do this like this: Script in brick:

local Event = game.ReplicatedStorage:WaitForChild("ShowGui")

script.Parent.Touched:Connect(function(hit)
    if debounce == true then
        debounce = false
        if hit.Parent:FindFirstChild("Humanoid") and game.Players:GetPlayerFromCharacter(hit.Parent) then
            local Player = game.Players:GetPlayerFromChracter(hit.Parent)
            Event:FireClient(Player)
        end
        wait(3)
        debounce = true
    end
end)

Put the GUI in StarterGui to have it given to players on spawn. Local script in GUI:

local Event = game.ReplicatedStorage:WaitForChild("ShowGui")
local Frame = script.Parent:WaitForChild("Frame")
Frame.Visible = false

Event.OnClientEvent:Connect(function()
    Frame.Visible = true
    wait(10)
    Frame.Visible = false
end)

1. u diddnt do anything when the player touched the brick beside setting its health to 0
2. u diddnt indicate who the player is
3. u should make a remote beforehand not trough a script this is not neccesary but its easyer this way so make a remote in replicatedStorage

local Part = script.Parent
local Players = game:GetService("Players")
local remote = game.ReplicatedStorage.GuiWinner -- im asumming u named it GuiWinner u will have to change it if u diddnt

Part.Touched:Connect(function(hit)
    local humanoid = hit.Parent:FindFirstChild("Humanoid")
    if humanoid then -- if the thing that touches the part has a humanoid in it it will try to find a player and fire a remote
        local player = Players[hit.Parent.Name] -- Getting the player u are searching for Hit.Parent.Name in game.Player
               GuiWinner:FireClient(player)--Fires the remote
     end
end)

In the local script 1. u want to make a screengui in playergui u cant see frames or anything if its not in a screengui 2. u diddnt use a remote to use OnClientEvent u used a ui

    local ReplicatedStorage = game:GetService("ReplicatedStorage")
    local GuiWinner = ReplicatedStorage:WaitForChild("GuiWinner")
    local Players = game:GetService("Players")
    local player = Players.LocalPlayer
local function onWelcomePlayerFired()
    local playerGui = player:WaitForChild("PlayerGui")

    local screengui = Instance.new("ScreenGui") -- making a screen gui
    screengui.Parent = playerGui
    local PlayerWin = ReplicatedStorage:WaitForChild("PlayerWin"):Clone() -- i assume u     want to use this multiple times so u should probably clone this
    PlayerWin.Parent = screengui -- parenting it to screengui
    PlayerWin.Frame.Visible = true
        wait(10)
        PlayerWin.Frame.Visible = false
end

GuiWinner.OnClientEvent:Connect(onWelcomePlayerFired) -- using a remote to use OnClientEvent

I hope this works i havent test it so im not sure i also hope i explained enoufh :).