Help with this script?

Ok so I have this script that I would like to use.

I am not sure how to configure It,

Clicks = 0

ClickDetector.Clicked:connect(function()
    if Clicks<20 then
        Clicks = Clicks+1
    else
    end
end)

Ok so I have in my workspace a brick with a surface gui. This is the LUA link to it;

game.Wokspace.FlyRobloxiaCheckIn1.SurfaceGui.EC.B777

This is the screen GUI link.

gam.StarterGui.FlyRobloxiaPC.Frame.B777.Economy.Counter.Value

How would all this be put together to make the counter (value) work? what would I put into the Counter part to make the number change?

Thanks Kieran