selectors issue, still can not find them

Hello, i still have trouble finding my selectors to define ti make the infinite scroll
work. I tried a few variations but none worked.
Some help would be super appreciated.

The theme I’m using theophilus (http://timothy-long.com/theophilus/)
My page http://bestbefore.gr/blog/

Thanks for any support!

https://wordpress.org/plugins/infinite-scroll/