creating a special type of custom row for a page

Hi,
Is there a way to add a custom field or field on a page that posts the day and time a message was written and then the message next to it? The client does not want the date and time to be able ot be altered. The field would show the most recent message tat the top. I would need to layer it on this page:
https://aficreditsolutions.com/client-update-profile-2/

It would go in the row that is below client progress updates (below dates, items disputed, credit bureau responses)
It would need to be multi-line as multiple records need to be added.