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.


Note:

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.