1.Go to template> Edit html
2.Press CTRL+F and the widget That you want to show only in posts for example HTML1
3.After searching you will find a code similar to the below code
<b:widget id='HTML1' locked='false' title='Author' type='HTML'><b:includable id='main'><!-- only display title if it's non-empty --><b:if cond='data:title != ""'><h2 class='title'><data:title/></h2></b:if><div class='widget-content'><data:content/></div>4.After finding it just replace with the below code
<b:include name='quickedit'/></b:includable></b:widget>
<b:widget id='HTML1' locked='false' title='Recent Posts' type='HTML'><b:includable id='main'><b:if cond='data:blog.pageType == "item"'><!-- only display title if it's non-empty --><b:if cond='data:title != ""'><h2 class='title'><data:title/></h2></b:if><div class='widget-content'><data:content/></div>That's its
<b:include name='quickedit'/></b:if></b:includable></b:widget>
Also see http://www.bloggerunlocker.tk/2015/06/gomato-3-blogger-template.html
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