How do I edit articles and seeds I've already published?
Click 'Publish' in the navigation bar at the top of the screen, then 'Edit Content':
This shows you the 'Edit Content' screen, displaying your articles and seeds in order of recency.
Click the pencil icon next to the content to edit it.
You can sort by Content Type:
You can also click the 'edit' button directly from your content - it'll be right next to the headline.