What's my problem?

My problem is this- what is this Wiki stuff all about eh?

${\displaystyle E=mc^{2}}$

This is another comment

This is a sub-heading for example

This is wikitext which is very easy to use.

Alternatively you can use the controls. this is bold text or itallic text

${\displaystyle f={\frac {Gm_{1}m_{2}}{r^{2}}}}$

${\displaystyle V={\frac {4}{3}}\pi r^{3}}$