Changes
→Abstract
While you are editing the article, there is a box labeled "Optional Excerpt" a little ways below the "Post" field. Put the abstract here. Use HTML markup as appropriate. What you put in this field is what will be distributed in our syndication feed and what will appear before the article as the abstract.
Assigned editors are ultimately responsible for a good abstract. Authors aren't always the best at writing good abstracts for their articles, you should probably revise or even write a new one from scratch as necessary, even when the author has provided one. Some of the abstracts for my assigned articles haven't even mentioned what I consider the most significant features of the article.
Since indexes (like EBSCO) may end up indexing abstracts and not full text (and even full text indexes may weigh abstracts more highly), the abstract should probably include any important terms that should 'hit' on the article, such as key technologies or concepts.