The banner is the yellow strip along the top of the page that displays a post from the banners posts.
This banners shows to new users and once hidden will not appear till the browser is closed and then reopened.
The banner post only has a single field for editing, links can be placed in the field within the banner content.
Active Field
If a banner is marked “active” then it will display on the site, if there is more than one “active” banner then the one highest in the post list will display.