How to write LaTeX formulas

Here's a quick tutorial to help people who want to post LaTeX formulae in their Wikia posts. For example, $$1 \neq 0$$, in the Source Editor, would produce $$1 \neq 0$$
 * 1) Go into your "Source Editor". This can be accessed by clicking the symbol with three bars at the top of the regular post editor and clicking the double square brackets on the drop-down menu. This is an extremely important step, as otherwise the instructions below will not work!
 * 2) Write the HTML tags $$ (at the beginning of your formula) and $$ (at the end of your formula).
 * 3) Write the LaTeX code in between the tags. Do not include the typical dollar signs, double dollar signs, or \[ ... \] symbols.

Please comment below if this is unclear. Thanks!