If you are looking for an easy way to announce something to your exchange users, you came to the right place. There's a built-in announcements plugin available on HollaEx Kit.
You'll be able to find the announcement plugins at plugin section of your exchange admin panel.
From here, you can add any type of announcement for your exchange user.
The announcement will be a post type, which going to be remain on the side bar of your exchange main page.