The Editing Help is on a seperate page. It explains how to format an article.
More help pages on editing in wikitext can be found at meta.wikimedia.org/wiki/Help:Editor.
Here is a list of the menupages. Clicking on them allows to directly edit them:
To put images online use image upload.
You can also directly edit any page by appending the string "?action=edit" to its URL.