The Post tab sets the base post details. This is important when referencing the posts is creates. While the reference post does have the title and content copied, the actual content returned from
the_content();, is filtered through the source entry and uses the data from the entry. They use magic tags that reference fields in the table and meta_keys found in the meta table.
This has 3 fields; Post Title, Post Content, and Default Status.
Post Title: This is the title structure that is used when referencing the post title.
Post Content: this is the structure to use for creating the post content.
Default Status: This is the post status for entries from the table. If set to draft, you can manually change the status in the post type admin page.