1. Go to the Facebook homepage and log in to your account.
2. Click on the "Settings" icon in the top right corner of the screen.
3. Select "General" from the left-hand menu.
4. Scroll down to the "Messages" section and click on "View All Messages".
5. Click on the "Trash" folder in the left-hand menu.
6. Select the messages you want to restore and click on the "Restore" button.
The restored messages will appear in your inbox.