If you want to delete a message on Google Hangouts, you can do so by following these steps:

  1. Open the Hangouts app on your phone or computer.
  2. In the main chat window, click the three lines in the top left corner (or press CMD+A on a Mac).
  3. Select Messages.
  4. Click the message you want to delete.
  5. On the right side of the message, click Delete (or press CMD+D on a Mac). ..