when editing an article wordpress normally provides features like excerpts and so on below the editor box. Are those not supported in shoutbox? I also important some articles from another blogs with excerpts and the theme reads out those excerpts. but I cannot change them.
At the top of the editing page is a tab called Screen Options. Click that and it will drop down a list of all the possible boxes and things that can be displayed on that page. Just check off the ones you want to show.