Available once a Targeted resume has been auto-scored below 90% match. Clicking this takes you to the Experience Station, where suggestions appear on the relevant experience cards as they finish generating — that's where the bullets actually live, so that's where you review them. Accept applies a suggestion to the actual bullet (safe to undo later from that same card) or Reject leaves it as-is; nothing changes until you decide. Once you've reviewed what you want, come back and hit Regenerate to recompile with the updated bullets — the resume is scored again automatically so you can see whether it helped.
Still stuck? Report a bug or request a feature.