menu list not showing in blog entry

Hi

I’m a big fan an happy user of the boldial template. i want to assign diferent menus to blog entries but i don’t have the “Main navigation” settings in my blog entries, only in the pages. https://snag.gy/TOvyku.jpg

Please let me know how can i display this menu list in the blog entires backend. I know is simple but still don’t know how to doit.

Thanks in advance