WP-PageNavi not present on post pages

I installed this theme yesterday and love it. It has many features that I wanted on my site, including page numbers at the bottom of pages. I installed WP-PageNavi and it works fine on archive or category pages, but does not show up on single posts. What I would like is that: 1) I click on an archive category and WP-PageNavi lists pagination for that category. (OK) 2) I click on one of the links to that post and WP-PageNavi puts the previous and next links beneath the article. (not there) I have created a child theme and have found this: //catchresponsive_content_nav( 'nav-below' ); So these links seem to be commented out. I uncommented this line, but it still does not display previous or next (or << and >>). Anyone have any suggestions for getting pagination on the single posts in a category series? If this works in another catch theme, please let me know. GREAT THEME!