You may change you tune about the site being helpful from the advise I can give you on this. Without seeing the pattern, my only suggestion is to re-read the directions. Somewhere, either where you cast on, or decreased, or cast off they probably mention that 'this' is the center seam. For example it might say: Center seam, cast on xx; or Center seam, bind of XX.
Sorry I can't be more helpful, but I'm only basing this on other patterns I've seen. Maybe one of our illustrious peeps here knows this pattern. :thinking: