To delete a message, navigate to the chat with the message you'd like to delete.
Click/tap the 3 dots icon in the top right corner of the message and a drop-down menu will appear. Select 'Delete'.
A prompt will appear and ask for your confirmation to delete the content. Click 'Delete Message' if you wish to delete this content.
To Restore Your Deleted Chat Messages
Go to the message that you deleted and click the 3 dots icon, and then click on 'Restore'.