Mi,
Get familiar with the developers tool kit in the admin panel

  1. https://www.zen-cart.com/tutorials/index.php?article=39
  2. Search for: Have you seen this
  3. includes/ languages/ english.php
  4. around line 400
  5. define('BOX_HEADING_BANNER_BOX2','Have you seen ...');
  6. Remember to leave the single quotes around the wording.
  7. I noticed you are still using the classic template
  8. Take time to read the Tutorials/FAQ and search for Overide system