Featured Image Caption makes it simple to show a caption with the featured image of a post or page. It works seamlessly with most themes, with no coding required. If you like to mess about in the code, it supports that too.
- Upload the
featured-image-captiondirectory to your site'spluginsdirectory. - Activate the plugin through the
Pluginsmenu in WordPress. - Review the plugin options found in
Settings>Featured Image Caption.
All plugin documentation can be found on the wiki.