[Grace Themes]

To set the innerpage banner for all pages/posts
Go to Appearance » Theme Options » Homepage Slider » Inner Page Banner

To set banner image for individual page, just edit the page and select Featured Image of size 1400 x 350 pixels

Please check the sample page for selecting page featured image
(See at the bottom right side)

Also remove any of the image which is set from Appearance -> Header

Regards
Grace Themes