Unable to set feature imaged

Hi Hal, I’m trying your plugin and I love it BUT i’m not able to set any feature imaged with my theme and without this feature I must change plugin.

I look inside my theme and i find the post_thumbnail featured inside single.php, see the code at this link : https://gist.github.com/anonymous/71437459335c5d9b4819

In this link, instead, there is the code of “theme-thumbnails.php” with there’s a function called “add_theme_support”
https://gist.github.com/anonymous/63aa95a15bf997752930
For another plugin I’ve to add, in the array, the name of the class of the plugin; I tried with your ‘testimonial_rotator’ but nothing is change.

Can you help me ?

Thanks

https://www.ads-software.com/plugins/testimonial-rotator/