Mosts StudioPress themes include a after entry widget coded into the child themes functions file.
Generally the widget only displays after single posts.
If you would also like to display exactly the same widget content after single pages, you can modify the code from this:
The modified code includes a conditional tag with an array for single posts and pages and won’t display on archive pages.
if ( is_singular(array( 'post','page' ) ) )
If you want to create a new widget which displays after all single pages only, grab this code.