Granama1, the changes are not contiguous. But each one has individual and specific row/column co-ordinates. As you “progress” the options for change locations reduce. Since you seem to know the “way”, it should be a matter of looking along each row for a potential change that will leave a real word (or words where entries cross) using the relevant letter from your “way” and which does not re-use a column already containing a change.
If anyone thinks this is too detailed an explanation - or just too ineffably tedious! - please shout and I give Norah carte blanche to delete it.