Sparkling theme author box and related posts

Hello there,
I am using sparkling theme on my blog
I want to put author box below all my posts and related posts. Can I achieve this through some built in widgets or need to install some plugins. If it requires plugins then can you please suggest plugins to install.

Thank you.

Hi Swapnil,

I hope you are well today and thank you for your question.

For related posts you can try using any of the following plugins.

To display author box use any of the below plugins.

Best Regards,