By default feeds are public, but you might want to cultivate a community with a little privacy. With subscription lists, you can! This guide will walk you through creating your first subscriber list and then apply it to one of your feeds.
You can also create a block list and restrict certain people from viewing your feed entirely!
First head over to the subscriber lists page by using the sidebar. After that click the plus icon to create a new subscriber lists.
Give the list a name and add some users.
Now that you've created a list all you need to do is add it to a feed. To do this head over to the settings for that feed.
That's all you have to do! Now only the users in your subscription list will be allowed to view the feed.