This Site should help a little bit to understand how to manage the site:
Add youtube video in Article
If you are working in a Article with Text field you can put always a youtube link, wihtout any code, that will be showd as video on the website - very easy
--> at the bottom of the main site press edit if you are logged in and change the youtube url to change the current video.
Manage Videos
Videos are listed in the way the youtube Playlist on crosbys profile is set. Add Videos to the playlist in youtube and they will be show on the site within 24hours
Edit Article / Site
Edit almost all Articles by click at the "Edit" field in the bottom of the Page
Manage Site
List (Releases, News,etc..) There is a blue button at the bottom of the site. Do not use it. Instead use the menupoint "Add (Releases, News)" for creating a new article
Manage Pictures
In the bottom of the Picuture Managment Site it is a module that indicateds the dimensions and places for galeries and sliders. You can upload files by drag and drop or rightclick "upload" in the selected folder. If the file has a wrong dimension you can rightclick and resize / Crop the image