Once you have joined the site you will be able to edit pages. Click on the edit button at the bottom of the page. This will open an editor.
To create a link to a new page, use syntax: [[[new page name]]] or [[[new page name | text to display]]]. Follow the link to create a new page and instantly edit it! For an external link the syntax is: [link text]. If you put a * in front of the link it will open in a new tab.
Creating and editing pages is easy and there are many options that let you to create powerful sites!
Please visit Documentation pages to learn more.