Not able to find right class or ID

Thanks a lot for a great plugin.

I tried hard but could not able to get right selectors.
I am using QAengine theme “http://www.enginethemes.com/demo/qaengine/”

I tried to find out and here what i found,
Navigation Selector: row.paginations.home
Next Selector: row.paginations.home a.next
Item Selector: li.question-item
Content Selector: ul.main_questions_list

Please help to know what is wrong in the above selection.
Thanks a lot in advance.

https://wordpress.org/plugins/yith-infinite-scrolling/