The Portal provides a list of messages that have been sent in a Channel or Room. Messages include closed captions, SCTE markers, and ID3 tags as well as chat messages.
Details about chat messages are described in the API Documentation for each platform, e.g., Web.
Sort the list by clicking on a column heading (e.g., clicking on "Timestamp" will sort the list by message date). Clicking on the column heading again will reverse the sort order (e.g., clicking on "Timestamp" when the list is sorted with the newest item first will change the sort to show the oldest item first).