Adding modules to the mainnav position.

Hi Again

Two questions in one for you guys this week, I think the answer will be related so I thought I'd post them together.

I'm using the t3_bs3_blank template and I'd like to add modules to the mainnav position.

Firstly I would like to my search form to the mainnav, similarly to the way the search is located on this website, on the right, although I don't need it to hide and show like it does on this site. I tried assigning it to the mainnav position but it doesn't show at all.

Secondly, I wanted to be able to add a second menu to the mainnav, that shows up underneath the main navigation. The menu is a registered user menu and would only show if the user has the correct access. Again I tried assigning it to the mainnav position but again it doesn't show up.

I currently have both these as modules in the sidebar but it would be great if I could put them in the mainnav.

Any ideas? And Thank you again for all your help.