adding attributes to nav menu tags changing .sub-menu class

1st Question: Here’s the block of code wordpress outputs and i’m struggling with:

<ul class="nav">

	<li id="menu-item-443" class="dropdown menu-item menu-item-type-post_type menu-item-object-page menu-item-443">

		<a href="http://localhost/bs.atgfw.com/wordpress/about/"></a>

		<a class="dropdown-toggle" data-toggle="dropdown">About</a>

		<ul class="sub-menu">

			<li id="menu-item-444" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-444">
				<a href="http://localhost/bs.atgfw.com/wordpress/about/meet-the-staff/"></a>
				<a class="dropdown-toggle" data-toggle="dropdown">Meet The Staff</a>

			</li>

		</ul>
	</li>

how do I combine both anchor tags into one anchor tag?

2nd Question: How do I change the ul.sub-menu class?