Customizing Previous Post Title and Next Post Title

Thank you David. I have completed upto number:
5. Go to Display Rules and set Location to Post > All Posts. Done that but can't see social sharing anywhere on the blog.

At the "Add New Element" Page, I see a "publish" button by the right. Am I supposed to click on it please?

Yep it needs to be published :)

Ok. Thanks.

Ok. Done with Social Sharing. Next is Jetpack Related Posts.
Thank you so much.