"This video is an introduction to using Nexis Uni (formerly known as Lexis Nexis Academic). Learn how to run keyword and field searches, refine results, discover topics and conduct guided searches for sources in the extensive Nexis Uni database." This video starts at 27 seconds mark (University of Alabama Libraries, 1:55).
"Learn how to conduct a basic search in your library's NewsBank resource, including Access World News and America's News." The video has no speaking (NewsBank, 1:37).
This video starts at the 55 second mark and will guide you through a basic search (Margaret Keys, 2:44).