How do I add my help blog to my main blog tabs?

we are setting up the blogs using Edublogs homepage theme and another help blog for all of the support issues. I want to have a tab on the main blog to go to help/support but I can't figure out how to make it work. Is this possible - am I missing something really simple?

ie: url blog.ourblogs.com and the tab needs to go to blog.ourblogs.com/support

Thanks!
Helen