On Discover, you can find a new publication by using the search bar or by clicking on a category that interests you.
For publications you find under Categories, you can automatically subscribe by tapping the "+" icon.
When on a publication, the easiest way to subscribe is by tapping the Subscribe button.
What happens after I subscribe?
You're now a free subscriber and will receive a confirmation email from Substack with additional upgrade options to become a paying subscriber (if the publication has paid posts) and a Welcome email from the author.
Any new posts will appear in your Inbox and you can access past posts by tapping on the publication found in your Library.