1: Facebook open.
2: Click on the Messages icon in the upper right corner of the screen Fix Pname Com Facebook Orca Error. It is the one that is between the buttons for friendship requests and notifications.
3: Click on the thread of the message you want to permanently delete so that it appears at the bottom of the screen.
Tip: You can also open all threads at the same time with the See All link in Messenger at the bottom of the pop-up window, but if you do, skip the next three steps and go to Step 2 in the next section.
4: Use the small gear icon next to the exit button of that window (called Options if you place the mouse over it) to open a new menu.
5: Select Delete conversation ... from that pop-up menu.
6: When asked to delete all this conversation, choose Delete conversation.
How to permanently delete the chat history of Messenger.com
Follow these steps to remove complete Facebook messages from Messenger.com or Facebook.com/messages/:
1: Visit Messenger.com or Facebook.com/messages.
2: Find the Facebook conversation you want to delete.
3: At the far right, next to the recipient's name, click on the small gear icon to open a new menu.
4: Click on the Delete option.
5: Click Remove again when asked to confirm.
If you are interested in deleting only the specific messages you have sent, or the messages that someone sent you, do this:
1: Locate the message you want to delete.
2: Pass the mouse over it so you can see a small menu appear. What you are looking for is a button composed of three small horizontal dots.
If you are deleting a Facebook message that you sent to them, the menu will appear to the left of the message. If you want to delete something that was sent to you, look to the right.
3: Click on the small menu button and then press Delete once, and then again if you are sure you want it to be deleted.
Note: Facebook's mobile page does not allow you to delete messages, and you can not even see Facebook messages from Messenger's mobile website. Instead, use the Messenger mobile app as described in the next section if you want to delete conversations or Facebook messages from your phone or tablet.
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Use the Messenger application to permanently delete Facebook's chat history
Follow this first set of instructions to delete a complete message in Facebook Messenger:
1: Open the Messenger application on your mobile device.
2: Press and hold the conversation you want to delete.
3: Choose Delete conversation from the pop-up menu.
4: Confirm the Delete conversation option.
Here's how to delete a single Facebook message from a conversation:
1: Find the conversation and the message you want to delete.
2: Press and hold the message to see a new menu at the bottom of the application.
3: Choose Delete once, and then again when asked.