In order to change a Blog Entry, you must first go to "Your Blog" which shows a list of items you currently have in your blog.  At this point you can either view the entry by placing the mouse arrow over the entry and clicking, or you can go directly to edit mode by selecting the pencil arrow just to the right of the entry.  There are red arrows showing where to select the entry or pencil icon.

If selected the entry, it will display the entry as it is posted in your blog.  You can view your entry and now decide to go back to the list, or edit it.  Select the pencil icon if you need to edit this entry.

 Once you are done editing your entry, you now need to save the changes.  Click the disk icon once all changes are made to your satisfacton.