If you are allowed to edit pages in this Site, simply click on edit button at the bottom of the page. This will open an editor with a toolbar pallette with options.
If you want to discuss page content, click on the discuss button at the bottom of the page. This will open a forum page for the page where you can start a new thread or respond to existing threads.
To create a link to a new page, use syntax: [[[new page name]]] or [[[new page name | text to display]]]. Follow the link (which should have a different color if page does not exist) and create a new page and edit it!
Images to be shown on pages should reside on external site (such as Flickr) if they are large or be attached to a page if they are small (less than 100 kb). The attached image must be uploaded before it is linked to from the page.
We have 300 MB of storage for attached files and images. Please be judicious in the use of this space.
Although creating and editing pages is easy, there are a lot more options that allows creating powerful sites. Please visit Documentation pages to learn more.