If you want to delete a message on your Samsung J7, follow these steps:

  1. Open the Messages app and locate the message you want to delete.
  2. Tap on the message to open it in its full screen view.
  3. On the top right corner of the screen, tap on the three lines icon (…) to open the menu.
  4. Select Delete Message from this menu.
  5. Confirm your decision by tapping on OK button. ..