Please know that first you must be a Trusted Author in order to be able to edit your articles. For more information on how to become a Trusted Author please go to: http://www.selfgrowth.com/node/1793551
If you are a Trusted Author, you can edit your articles by logging in to your SelfGrowth.com account. You will see under Current Information a link to Articles Approved. Click it, and you should now see a list of your articles along with a little edit link next to the title.
Note: If you have an article on SelfGrowth.com but don't see it when you log in and go to "View My Articles," it's likely it is associated with a different email address. Fill out our feedback form at http://www.selfgrowth.com/feedback.html and send the article link.