For single chat:

  1. Go to your Chat Box
  2. Long Press the preferred Message that you want to Delete
  3. An option to delete the Chat will show, then choose 'Delete'

For an entire thread:

  1. Go to your Chat Box
  2. Tap the three white vertical squares located in the upper-right corner of your Chat Box
  3. You will see a list of commands, then select the 'Delete All Messages' option.


When you log out and log back into your account, the deleted messages will be visible again on your end because that option is not permanently deleting the messages. After a certain period, the system will permanently delete the messages that you have on your end.