Check out one of the many reference manager alternatives below:
Zotero (pronounced 'zoh-TAIR-oh') is a free add-on for the Firefox browser that can help you keep track of, organize and cite your research.
It allows you to import PDF copies of articles, add notes to what you save and to work collaboratively with others. You should be using Zotero if you are writing a paper, preparing a presentation or doing any kind of research. It will save you time and frustration!
Maybe you'd like to see what Zotero can do before going through the tutorials. Watch this quick video to decide if Zotero is for you.