Everyone is not autorized the same on this site!

A guide to summarize who does what.

There are 7 credential levels, not counting 0-level meaning guests who are not registered as regular users.

Frontend Backend
Submit an articleEdit YOUR articleEdit EVERY articlePublish an articleEdit menus and articlesAdministrate components and modulesAdministrate languages, templates, users
Registered
Author
Editor
Publisher
Manager
Administrator
Super-Administrator

So only starting with the publisher level, it is possible for oneself to publish an article. With a lower level, the administrator of the site must do it.