When a piece of dynamic content is created, this appears as a Stand-Alone Webpage. To edit the webpage:
  1. Navigate to Content > Stand-Alone Webpages
  2. Search for the appropriate Web Page (the description will read: Created from Email Dynamic Content dialog window.)
  3. Hover over the Web Page Name and click Edit Webpage
  4. Make any necessary changes and click Save
  5. Click Finish to close out of the content editor