Besides the standard HTML tags, you MUST also include a title tag in the page. This will set the title of the page you're writing. Example; <title "Foo">
Linking to pages inside of the GNU-Friends Wiki is done by encapsulating the page name in blocks, like this; \[\[index]]. If the page index exists, a link will be made to that page. If it doesn't exist, a small questionmark will be put right next to the link, allowing anyone to create the missing page by clicking on that questionmark.
If you want the link to have another nama than the actual page, you can include a description, like this; \[\[index|GNU-Friends Online]]. Then the link will be called "GNU-Friends Online" and point to the page index, if it exists.