Where will these links be displayed?

Hello, it depends on your theme it could be displayed on the author page https://qingdaohf.com/?author=1 but author sites seem to be disabled on your site, one more possibility could be in the wp-json: https://qingdaohf.com/wp-json/wp/v2/users

For my website, it appears on the head section of all posts that the author wrote.

• This reply was modified 1 year, 4 months ago by Steven Stern (sterndata). Reason: removed link

It’s totally depends upon the theme code. But most case on Head section, Footer section or on Contact us page.