Changing the Title & Description on the banners on Service Portal (SMSP aka Propel)

I've read the Propel guidance about how to change the text (title and description) in the scrolling banner on SMSP/Propel and it tells you how to access the file etc BUT it fails to tell you how you edit the acutal text as they are in some other file....

I know this file to edit is /opt/hp/propel/launchpad/conf/dashboard.json but not hot to edit the Title or Descirption fields....

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