When adding or editing a new post, I am not seeing the excerpt module described at http://en.support.wordpress.com/splitting-content/excerpts/
Immediately under the post editing window is a module labeled "Likes and Shares". But that's about it--no excerpt module is visible.
Is there possibly a way to add this to the post edit page?
My theme is Coraline, if that makes any difference
The blog I need help with is doylebarnett.wordpress.com.