EasySocial's main menu navbar needs to be behind my template's main menu (z-index)

Can you tell me how to shift my EasySocial Navbar back, so it's not in front of my site's Main Menu? I assume this is a z-index change needed? I can't figure out where to make that change. Thank you. See screen shot:

http://awesomescreenshot.com/0f51wcy005