This is the "news" feature in savannah projects, which is automatically fed into planet.gnu.org. But since Arnold doesn't want to enable news, there has to be a way to "manually" submit a news item for planet.
There is no such way, the front page of the planet is aggregated feeds. So whatever manual manner would require an rss feed hosted somewhere, be that via Savannah or some other feed. For planet.gnu.org issues, one should contact webmast...@gnu.org or pla...@gnu.org
