The following is the tutorial on How To Move Main Navigation Below Header, basically the process is telling Thesis theme to remove thesis nave menu hook before header and place it right after the header and it can be done very easy by adding additional codes inside your custom_functions.php but first off find this line:
by on October 3, 2009
Thesis Theme, Guide To Add Adsense After The Title And After The Post
If you want to add an ad (such as Adsense, Chitika or any ad) inside your single page right beneath your title or after the post then you need to add an additional codes to your custom_functions.php, because in Thesis whenever you want to modify its look or to adding anything you need to edit [...]