For iOS:
Enter the chat section and, on the chat you want to delete, slide your finger to the left. Then press "Delete".
For Android:
Enter the chat section and, on the chat you want to delete, keep your finger pressing. At that time, a pop-up window will open stating “Delete chat”. If you press there, the chat will be deleted.
Important: keep in mind that once you decide to delete a message, it will be deleted from our database and we will not be able to recover it.