I really need to know this, as its becoming difficult to write equations...
Click on any Latex code, and lo and behold, all shall be revealed!
As arildno indicated, just click on any typeset string and a popup will appear with the corresponding script.
If you're talking about using LaTeX in more generally than just on these boards (ie. to actually write papers, etc.), take a look at the MikTeX distribution (www.miktex.org). I suggest the Texnic Center IDE if you're using Windows; I've used it for years and have never had any problems.
LaTeX tutorials abound; here are some examples
Or, you can also try this not so short guide to LaTeX. Actually, I find it pretty well-arranged. It contains most things you'll probably need from LaTeX. Just one downside, it's pretty big...
Separate names with a comma.