To retrieve a list of the content you have authored, see View personally authored content
Edit from the actions box.
Edit link will take you to the edit form for your
particular piece of content you wish to edit:
Body Textarea/File Upload edit form (Documents)
Lead-in/Body edit form (News Item)
File Upload edit form (Files, Images)
Simple edit form (Link, Favorite, Event)
Enter the changes you wish to make to the content in the form or browse to changed version of the content on your filesystem as appropriate.
View link from the actions
box and view your content with the changes in place.