Adapools headers

I see some stake pools are able to put a header announcement type thing at the top of their adapools page. How is that done?

It’s a free promo feature, take a look at the Share/Promote tab on a pool’s detail page

//edit: just reread your post, you probably didn’t mean the promo… you can sign up and verify as pool owner, so I’d assume that’s where you can set the announcement