Well, ngtechzone, their a difference between Popular Post widget and Related Post Widget. Related Post widget simply show the post which are related to the post which user is reading/browsing and in other hand, Popular Widget shows you the most popular widget of a blog.
@Abdullah- If you’re looking for how to add ‘Popular Post’ widget on a blogger blog, then here’s what you have to do-
- Go to Blogger Dashboard > Layout > Add a Gadget
- Choose Popular Post widget from that link and customize it in your own way.
- Click on that orange ‘Save’ Button.
Next, look at your blog (just open it) and you’ll be able to see the popular widget on your blog.