I know you have seen some blog with Related Post Summaries at the bottom. You are like how did they do it. These are the steps to get started:
1. Go to Linkwithin
2. Register your blog: On the right hand side close to the bottom side, you will see a table asking you to insert your Email, Blog Link, Blog platform, Width, and number of post to show with thumbnails.
3. Click widget to install it on your blog.
Install Widget on Blogger
1. Click Install Widget to open Blogger in a new window, and follow the steps below in that window. Login to your Blogger account if necessary.
2. Select a blog if you have more than one, then click on Add Widget.
3. (Optional) For better performance, Drag and Drop the LinkWithin box under the "Blog Posts" box.
4. Click on Save.
And you're done! The widget should now appear on your blog.