In the Studies section, click on an article under the 'Current Articles' to view them. You can comment on each article, or add to an article by creating your own under 'My Articles'. After you're finished writing the article, click 'submit' to send it to the administrator, who can approve (or deny) the article and have it appended to one of the existing studies.

If you'd like to write your own studies (and have them published later), use the "My Pages -> Studies" for your own personal Bible Studies. Note that only each user can see (and edit) their own articles unless they submit them to the administrator for publication.