Whenever editing the way posts look throughout your site, the following files need to be edited: index.php (front page) search.php (search results) archive.php (all archive pages, category pages, etc) and single.php (the way stuff looks when you actually click a post).
Now, you are looking for the following:
<p class="tagged"><span class="add_comment"><?php comments_popup_link('→ no comments', '→ 1 comment', '→ % comments'); ?></span> ....
This is how most wordpress stuff works, you're setting values for what happens if there are no comments, one comment, and multiple comments.
Just add "click here to comment" instead of "no comments" "1 comment" to "read 1 comment here" and "% commments" to "read % comments here"... that should do it.. just make sure you change that in all the files mentioned above.