How can i show a frame/text when a player hits a part?

So, the reason why this script doesn't work is because you are changing the Gui's in the StarterGui, the problem with this is that it doesn't represent the current Gui, which can be found in Player.PlayerGui. I'm not the best at explaining things, so here is a link to the PlayerGui on the roblox Dev Wiki

Anyways, with all that said and done, your script would look like this:

local plr = game.Players.LocalPlayer
local TextLabel = plr.PlayerGui.TextLabel
local Frame = script.Parent.Parent.Frame

Frame.Touched:Connect(function(hit)
    if hit.Name == plr then
        plr.PlayerGui.Waith.TextLabel.Visible = true
        wait(1)
        TextLabel.TextTransparency = 0.3
        wait(1)
        TextLabel.TextTransparency = 0.2
        wait(1)
        TextLabel.TextTransparency = 0.1
        wait(1)             
        TextLabel.TextTransparency = 0
        wait(1)
        plr.PlayerGui.Waith.TextLabel.Visible = false     


    end
end)

Let me know if you need any more help!