#7 - Aug. 25, 2010, 1:27 a.m.
As stated above, Ophielyn, the PrtScn-or print screen-button should be all you need to take a screenshot. This may be changed by altering the key bindings, so if you are not able to take a screenshot using that particular button I would check to make sure it has not been changed to something else.
The following article may provide further information: (
http://us.blizzard.com/support/article/21048).