What is a Wiki?
A Wiki is a website whose users can add, modify, or delete its contents via a web browser using a simplified Wikimarkup language.
Even if you don't know how to work with a wiki layout, it is GoodStyle to just start writing. Other wiki users can then clean up the layout for you.
Want to try? Start here Sandbox - for playing around (Scroll down and click "Edit")
How to create a new wiki page
You can use the wiki's URL for creating a new page. The URL to an article of the wiki is usually something like this:
If you replace article with the name of the page you wish to create, you will be taken to an edit page for that article, where you can create the new page by typing your text and saving it.