uncle_w, there may be some confusion. Heisenberg is referring to the cryptic title of the puzzle, but that has no bearing on the puzzle itself. If you have completed the grid, made the necessary changes to reveal the thematic Title referred to in the preamble, the only thing left is to make some further changes to unravel the five cryptic instances of the secret Sign. If you do this correctly you will then be able to read the two words of the Contest. This needs care because in two cases the unravelled secret Sign could start at two different points but only the correct starting points will enable the two words of the contest to appear.