Hey,
1) In header.php replace:
<!-- there is room for 3 icons, below are predefined classes for others if you want to use them instead -->
<!--
<li class='flickr'><a class='ie6fix' href="#">flickr</a></li>
<li class='facebook'><a class='ie6fix' href="#">Facebook</a></li>
-->
with:
<!-- there is room for 3 icons, below are predefined classes for others if you want to use them instead -->
<!--
<li class='flickr'><a class='ie6fix' href="#">flickr</a></li>
-->
<li class='facebook'><a class='ie6fix' href="#">Facebook</a></li>
and instead of # insert the url to your facebook account.
2) Newscast doesn't offer a "popular" post widget. You can search one here: http://wordpress.org/extend/plugins/search.php?q=popular+post&sort= though.
3) Create two menus. The top one call "First", the other one "Second". I wrote a short how-to here: http://www.kriesi.at/support/topic/i-can%E2%80%99t-create-a-custom-menu-the-menu-behaves-weird
4) It depens on whicjh slider you're using. The news slider + accordion slider don't support the autoplay feature. The other slider supports it but you need to activate the feature: Newscast Options > Mainpage Options.
5) You can enter them in the menu item description field. See: http://www.kriesi.at/support/topic/i-can%E2%80%99t-create-a-custom-menu-the-menu-behaves-weird
6) It's not possible without some custom work/code.