Make credit box for each author in a multi-author blog

You have a blog with many authors who contribute content ,and you want to show their short bio in credit box at the end of each post . This idea was in Wordpress for a long time ,but not in Blogger . I tried several times ,but none of them work . Thanks to comment of ابن الملكـةHe gave me a code that work in a comment ,and now I want to share this code here .Both of me and ابن الملكـة hope this