The Portfolio section is a place to feature your best work separate from the Articles section which is automatically populated by Muck Rack. After adding new articles, you can also re-order the articles as you like. Here's how:
Click on Your profile in the upper navigation bar
Click on Edit profile
Find the Portfolio section on the left-hand side
If you would like to order the articles by date published: click Order by date then click OK to confirm
If you would like to order the articles manually: click Reorder items then drag the articles into the desired order. Once completed, click Save changes