Update video tutorial

git-svn-id: https://plugins.svn.wordpress.org/wpnewsman-newsletters/trunk@1007830 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix video link

git-svn-id: https://plugins.svn.wordpress.org/wpnewsman-newsletters/trunk@1007831 b8457f37-d9ea-0310-8a92-e5e31aec5664