Now you here is a displaying related posts beneath each of your blog posts, along with thumbnails. The related articles are chosen from other posts in that same category/label/tag.
How to Add Related Post Widget After Posts on Blog
Just Do this Steps adding the Related Posts Widget to Blogger/Blogspot
Step 1. Go To Blogger Dashboard >> Template >>Edit HTML;
Step 2. Check the "Expand widgets template" box;
Step 3. Search (CTRL + F) for this piece of code: