Popular posts tab

Good day!

I just updated the theme of Supernova (1.5.2). I decided to use the tabs (latest blog, popular , recommended) so my visitors can use it to watch the posts. But if I click on popular, I don’t see the popular blogposts. The recommended tab works.

So.. I checked the options of the popular posts. It does not work with ‘Actual Count’ and ‘Number of Comments’. And I can choose for ‘Let me select’, but I don’t know how I should choose. What am I doing wrong?

Website is: http://burogu.avo-forum.nl/