By default every newsletter has a read link that you can share with your audience. It will look something like `http://newsletter.dymapps.com/read/1234`. It may be cumbersome to update everything every time you create a new newsletter. You have to update the website, the link on your Instagram, send out new emails, put the new link on your Facebook... ugh. This is what the "featured" newsletter is for!
Every publication you create has it's own link, something like `http://newsletter.dymapps.com/featured/321`. Now you can put this link everywhere. Then, when you create a new newsletter make sure the "featured" switch is on and this newsletter will override the featured link! It doesn't delete or change the read link for any of your older newsletters, it simply makes it easier to share your new, updated info!
You can set a newsletter to "featured" in the "share" settings dialog box.