"To start editing a ToribashWiki page, click the Edit this page (or just edit) link at one of its edges. This brings you to the edit page: a page with a text box containing the wikitext – the editable code from which the server produces the finished page, and often called the edit box."
Guess what.
That was all on the links that 3vil provided.
If you cannot even thank him for helping out then screw off and be thankful that I am helping you.
Then how about you stop asking here and click the damn links that 3vil posted.
One of the user rights that can be set for a user group is "createpage", the right to create a new page. A wiki can grant this right for example to all users who are not blocked (this is the default setting), or only to those who have logged in.