Hello @istandard,
Thanks for writing in!
The Slider Settings Above and Below Masthead are only available for Pages. It can only be done with custom development to make it available for posts. That is outside the scope of our support though.
You might want to check out this threads instead:
https://theme.co/apex/forum/t/add-revolution-slider-above-masthead-for-posts-also/48118,
https://theme.co/apex/forum/t/different-header-for-post-categories/41876
In the code in those thread, it is using is_single() as the condition. And this would be for all single blog post. If you want to display only for a specific blog post, you will use is_single(123) where in “123” is the post ID. To find out the post ID, please check out this knowledge base article: https://theme.co/apex/forum/t/setup-how-to-locate-post-ids/59
For the is_single() condition, you might want to check this out:
https://codex.wordpress.org/Conditional_Tags#A_Single_Post_Page
Hope this helps.