Upload the contents of the directory 'mediacore-ingest' to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress
Go to Settings -> Mediacore Ingest and enter the URL of your Mediacore installation (the plugin uses this URl to filter out syndicated content from non-Mediacore sites). You may also check the box to turn Mediacore categories into tags on the resulting WordPress posts.