Beneath the area, where you will type your answer to a question, if you scroll down, there is a place to provide reference links. You can copy and paste any references you used, up to three, in that area below your answer. You go to the top of the page you used as a reference link, copy the http address and then you simply paste it below. By using references, it shows that your answer is backed up by other research and that you are not simply guessing. A good answer should be ninety words in length or longer and then, provide a least one reference link. Good luck.
There is no cite this page on the Q&A area of the site, it is only on the study guide pages. They should add "cite this page" to the Q&A area. For now, just use the easybib link to tell you how to cite the page as a website.
For example, this page would be:
Where is the Cite This Page Button?. (2012). Retrieved Aug 16, 2012, from http://www.enotes.com/enotes-help/q-and-a/where-cite-this-page-button-354230