Hello,
You can check this post now -> https://beautynix.fi/b2b/courses/8-body-wellness-ritual/
It looks ok and I think that’s what you wanted.
To make it work we made some changes:
1/ You have to upload your feature image here -> http://prntscr.com/yosjlq
2/ We added this code to your child-theme/functions -> http://prntscr.com/yoskdq
3/ We copied and changes single.php file via your child-theme/ -> http://prntscr.com/yosmyz
Regards