Related posts can be shown in many ways. You see 4 examples in demo too.
- Left to featured image : https://demo.acmethemes.com/supermagpro/blog/2015/12/11/cycling-competition/
- Right to featured image : https://demo.acmethemes.com/supermagpro/blog/2015/12/11/goal-goal-goal/
- Below content : https://demo.acmethemes.com/supermagpro/blog/2015/12/12/antique-in-sell/
- Below content ( another example ):https://demo.acmethemes.com/supermagpro/blog/2015/12/12/model-in-bike/
But you cannot show related posts in sidebar. And they are all dynamic not predefined.
Here in documentation you will see how to setup Related posts : https://doc.acmethemes.com/supermagpro/#SinglePostOptions,
Also you can override related post setting while adding/editing posts. And Related post are absolutely dynamic not predefined HTML/CSS.
If you get again any confusion, please feel free to ask without any hesitation, we are here to help you.