How to add a co-author bio next to a single post

Hello!

I would like to display the co-author bio on every single post on the sidebar, and I have found the snippet code on your website: https://danielbachhuber.com/2012/01/22/show-biographies-for-co-authors-at-the-end-of-your-post/

Could you please help me out with this problem?

I don’t know what tag I should use to display the co-author bio.

Thanks