Using on main index?

I have a basic photoblog, every post is one picture at a time, and installed this plugin to scroll through the pictures easily.

It works great, but am looking to add it to my main index as well. The problem is that when users arrive at my site, the arrows are not available because they are on the main index, even though the index page just displays the latest post.

The only way for a user to scroll through my pictures (single posts) using this plugin would be to arrive at my site via a link to a post, rather than just typing in the home page.

Is there something I can change to the code to have the arrows appear from the main index, so users can use it instead of the basic wordpress post navigation system?

https://www.ads-software.com/extend/plugins/wp-single-post-navigation/