Every page has an "Edit" link at the bottom. You can click Edit and change the text within the page.

See the FAQ for who can edit (everyone).

What else can you do:

• Wiki Text Format - for what your text looks like
• Revisions - What are they, how do you view them

To prevent spam - you will be asked a question the first time you edit a page on a new browser. The question appears at the top of the page.

See also: How To Add Pages