Once a Document has approved by all designated approvers, the option to send the document to the Published stage will be enabled under the Cycle section.
Clicking on Published will open a window where the user can select the Group(s) that will be the Audience for the document. The audience are the users who will read, take quizzes, acknowledge, and use the document. Once the audience of the document have been selected, click on Send to Publish the document.