No option to add post content in advanced tabs

Happy add-ons Advanced Tab shows only few options as listed below,
1. Post Custom Field
2. Post Date,
3. Post Excerpt,
4. Post ID,
5. Post Terms,
6. Post Time,
7. Post Title,
8. Post Summary.
How can I add post content in a Tab?. Post summary has limited to 150 characters. But I need to show full post content. Is it possible to show the full content?.

Thanks,
Swaminathan.

The page I need help with: [log in to see the link]