How do I make it so that someone must approve a document before it's published?

You can create a document that someone needs to approve before it can be published. You can do this at any time before you publish the document -- such as when you first create it or after you've saved it as a draft.

Note: An administrator might already have chosen someone to approve documents in a space.

While you're editing the document, click the Collaboration Options link. Under Users who must approve for publication, enter the name of the person who should approve. You can also click Select Users to browse for the person's name.