Hi Jessica...if I understand this correctly, you are showing the full post on the blog's home page, along with all the other posts in full view. But you want a link for a person to click on to leave a comment because the comment form is not shown on the blog view of a post until you click on the title (or a Continue Reading)?
I did find this and tested it:
The code would go replace the <p class="more-link" .... in the content.php file. But this means modifying the core theme files which is not recommended. Use a child theme instead (which this theme theme has one to install...found in a folder called child-theme.