If you finished to compose your longread and feel like you're ready to start assigning it to users, click the Publish button at the top right corner of the page.
In the pop-up window, select a folder you want to save the content item to and click Publish.
While editing, you don't need to save the longread on purpose. The longread draft will be autosaved, and you will be able to find it in the Courses section of the iSpring Learn admin panel. To do this, open the Create menu and select Longread Drafts.