How do I edit a page?
To edit a page, click the edit link that appears on each page.
When you have finished making modifications, click the Save button.
How do I create a new page?
There are several ways to create a new page:
On the Main Page, fill in the box under “Create new article” and click ‘create article’.
How do I format text?
You need to place markers around your text, two ” each side of a word makes the word show in italics, ”’ makes it bold and so on.
For more formatting options see this extensive list https://www.mediawiki.org/wiki/Help:Formatting