@playX: Either you need to reduce it through “Appearance => Theme Options => Excerpt / More Tag Settings”, reduce the Excerpt length. Or there is option in your post called excerpt box under your post editor. Just type the text that you want to display on that excerpt box.
the Excerpt module will be under the post editor to create an excerpt for the post. If you do not see the Excerpt module, click the Screen Options tab near the top-right when writing or editing a post and make sure that “Excerpt” is checked.
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