Most of the time, you won't need to actually search ScienceDirect directly. You'll get directed here from WebBridge or by some other database. So, if you do need to search ScienceDirect and don't know how, feel free to come talk to one of us here at the library - we'll be glad to help you.
When you come to an article in ScienceDirect, your screen will look like this:
To find the Full Text of your article, look to the top of the page and click the icon that says "Download PDF".
To cite this article, click on the link at the top of the page that says "Export". From here you can choose to add this article to a citation manager (like EndNote or Mendeley), or you can choose to export the file as text, so you can copy and paste it into your document.
Also good to note is that you can find articles that cite this one on the right side of the page where it says "Citing Articles" - click this link to see a nice list. Click on any of those articles to see them. This is especially helpful if you're looking for more sources about the same subject as the one you found!