You can update the front page by creating new news items and adding them to the
News page. Check out old news items (
example) for formatting.
When creating new news items on the News page, create the page at News/YYYYMMDD. Keep it brief so that formatting doesn't go wonky on the front page with tons of whitespace in the right-hand columns.
Add a new DPL call to the top of the DPL call list, with the appropriate date.
Then remove the bottom DPL call (so there's three DPL calls), adding it to the small-text "archived" news at the bottom with appropriate formatting.
Shift the </includeonly> up a line so that there's three links inside.
(
historical diff for example)