Here's some examples of how to edit a wiki page

Image

1. click the embed button, give your image a specific name
   1. instead of File:Example.jpg I used
2. after you save the page, click on the name of your image and the wiki will allow you to upload the actual image

File Link

1. click the file link button, give your file a specific name
   1. instead of Media:Example.ogg I used File:Joey APT 2.xls
2. after you save the page, click on the name of your file and the wiki will allow you to upload the actual file

External Link

1. click on external link
2. replace the example with your link, replace the link title with what you want to call your link
   1. instead of link title I used LWN Website

Heading

1. click the level 2 heading button
2. replace the words between the equal signs with your heading
3. each additional equal sign means a lower level of heading
4. put headings between each of the things you have created

Make a Numbered List

1. Just put the number sign in front of each item
2. wiki will automatically assign sequential numbers