Citing Web articles in M.L.A. please help?

Working on my final for cl where I have to summarize several articles online, and cite them in MLA form. I'm used to doing APA so this is kind of confusing to me! I know how to do in-text citations from printed materials such as books, but I'm not sure about articles, especially articles off of the web. Should I put the authors name and the line of text in parentheses, or is this not necessary. Should I just put the author's name? Or is there something completely else I'm supposed to do. Please help!!!!