Co-author

Good afternoon,

I have one more question. I use the co-author plugin to add multiple authors to a post. All these authors link to an author-page. But I also need to add authors without a link to an author-page. For that I made a custom field where I can add other authors. But sometimes I only need an author without a page-link, but I always have to add an author in co-author, so I want to replace the author:”admin” with the author from the custom field. I want to replace it because if there are more authors with a link, they have to show also.

So I have now:

if(get_field('guest_author')){
						echo '<span class="guest-author" style="display:inline;">  ' . get_field('guest_author') . ', </span>';
					}

					
					coauthors_posts_links();
					

I tried something like this:

if (the_author('admin')){
						echo '<span class="guest-author" style="display:inline;">  ' . get_field('guest_author') . ' </span>';
					} 
					else {
                   
					coauthors_posts_links();
					}	

but it does not replace the author:”admin”

It would be great if you could give me a hand. Thanks already!