To add a new page to Wiki, all you have to do is come up with a meaningful title, capitalize all the words and String Them Together Like This. Wiki automagically recognizes it as a hyperlink. Alternatively, you can put anything into ?square brackets.
Then you can go ahead and ?Click The Question Mark at the end of your new hyperlink, and the Wiki will give you a window for making the new page.
http://phpwiki.sourceforge.net/The Wiki does not support HTML tags (see Text Formatting Rules). <tags>They will just render like text.</tags> Wiki is meant to be as simple as possible to encourage use.
Note that there is a feature that your system administrator can enable to allow embedded HTML, but there are security risks involved.