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.
|Submit an article||Edit YOUR article||Edit EVERY article||Publish an article||Edit menus and articles||Administrate components and modules||Administrate languages, templates, users|
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.