Once you create a new WordPress page, you may want to make it accessible from the tabbed navigation bar at the top of your site. This is an easy process.
Log into your WordPress dashboard.
Click on Thesis Options>Thesis Options.
Click on the + sign next to Navigation Menu>Select pages to include in nav menu.
Click the check boxes next to the pages you want to include.
You can drag and drop these fields to change the order of the tabs in the nav menu. The item listed highest will be farthest to the left on your site, the lowest, to the right.
You can also edit the names next to the check boxes. The page title is the default tab name, but that may be too long or otherwise not suit your purposes. Simply click on the name to change it to something more suitable.
Click the large, green Save button at the bottom of the page.
When you go back to your site, you should see your new navbar complete with all the pages you selected.