This plugin hooks into WordPress theme feature and overwrites the values on single post views if the post has been given custom header..
Your theme must support WordPress of Custom Headers theme feature..
If you need professional plugin support from me, the author, you can access the support forums at Theme Hybrid.
If you're author or just hobbyist, you can follow the development of this plugin on it's GitHub repository..
This is just one tool of many that I'm creating and making available via my Web site for making it easier for users to take more control over their styles on per-post basis...
Just to make sure, check with your author and make sure that they support WordPress theme feature.
In order to manage capabilities and roles, you need plugin like Members.
The capability required for being able to add per-post headers is one of the che edit header The user can edit headers on posts they have written. edit theme options The user can edit all WordPress theme options ...
Also, user must have the capability to upload new images, but this is WordPress thing and not specific to the plugin...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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