How to remove an article from your shelf:
Sign into your account and and go to the shelf portion of your MyJSTOR account. Scroll down to the article you want to remove.
You will only be able to remove an article after its been on your shelf for fourteen days. You'll know that you can remove it when you a button appears beneath the article description that says "Remove From Shelf."
PDF versions of some articles will also be available for purchase and download. If you purchase articles from your shelf, the PDF versions may be stored and accessed in your MyJSTOR account at any time.