I think this is meant to be a "hello world" level puzzle. You literally just click the cells and type to edit them.
Are you sure you can't edit once you highlight a cell? If so that's probably a bug.
Are you sure you can't edit once you highlight a cell? If so that's probably a bug.
Sometimes it will allow me to update the cells but whatever I type merely appends to the existing contents with no obvious way to clear an individual cell.
Now it seems to work... sort of... sometimes it'll clear one of the characters in the cell and sometimes instead the global handler traps it and attempts to navigate to the previous page in my web history.