This resource walks through the related posts module. You can edit the footer of a page by following the steps here.
If you are encountering specific roadblocks, please let us know what and where. The more details, information and screenshots you can provide, the better the Community can assist.
As I was going through the template, I noticed that I have already a module titled 'Related Post and Post Pagination'. This module is currently hidden and absent in the module.
Could I modify or alter this module to display the related posts ?