art3
Hi,
This will require customization on the layout of template. Basically, the 'head-right' position you're wanting to place the main menu belongs to the header block and the mainmenu is currently placed inside 'mainnav' block. So you will need to move the code which renders the main menu from 'mainnav' block to the 'header' block
[root]/templates/ja_fit/tpls/blocks/mainnav.php
[root]/templates/ja_fit/tpls/blocks/header.php
It needs some knowledge about PHP and also styling as when you change this, the style maybe affected.
Check out this documentation for more info about the layout customization: http://www.t3-framework.org/documentation/bs3-layout-system#about-layout