Cover Messages let visitors sign up for your newsletters, link to exclusive deals and information, or show them important announcements.
Login to you Cloudflare account & select your website on dashboard
Select “Apps” from top main menu
From the left drop-down menu select “UI & Design”
From the right search field type “Cover Message” & then select the “Cover Message” App from results
Fill out the form and follow prompts to create an engaging message for several purposes
Some on the Cloudflare website that can also help walk you through the process.