There are two methods for finding articles and authors:

1) Click on "popular tags" or "categories" of keyword on the "Articles" page. That will bring you to the page consisting of posts with the topic (author) of your choice.
"Popular tags" is found right under the menu bar.
"Categories" is found on the right sidebar. 
Be sure to do this on the "Articles" page. 
(try this one first, as it will be the most helpful)

2) Go into search bar, to the right of the menu on "Articles" page. Write in the keywords. A drop down menu will show up of some of the articles.

3) To find authors, you can also go to authors page and find your author, then click on the link by their name.

Notes:
Searches work individually on all blog pages.
***Method number 1 is the suggested, as it will bring you to the page.