i have no idea how to finish, although I have the 'object' drawn and I assume that the 'word spelled out in eight regularly placed cells' must be modified by changing one letter. I presume that we are still 'reading' the 'word' in the same way.
It is the where to go after that I do not understand. I know how the extra words work. It would seem that I have to change nine cells, and it seems obvious (from the end of the instruction) what they are going to represent. I also know how the 'object' works in terms of numerical representation. I was expecting, then, to have to replace six cells symbolically, and, indeed, those six cells look promising. Then the rest of the grid, including some lines, would be erased.
However, there are many ways of doing this, and the 'extra words' do not seem to have anything to do with it.