Co-authors template tags

I have spent way too much time trying to figure out where to Place the appropriate co-authors template tags in my template. I am using the Twenty-Ten template.

Not being a developer I assumed that the word pluggin meant just that and that when I plugged it in it would work. Having to add this code and knowing what the code is and where it goes is proving to be a challenge to me.

I would hate to have to pay my developer to add this code. So, I’m hoping you can give me the exact code needed for my template and tell me exactly where to install it. Telling me this, didn’t help:

To use them, simply modify the code surrounding all instances of the_author*() to something like the following example:

if ( function_exists( ‘coauthors_posts_links’ ) ) {
coauthors_posts_links();
} else {
the_author_posts_link();

Thanks for your help with this. I really need this pluggin to work!

http://wordpress.org/extend/plugins/co-authors-plus/