To create a new wiki page, first create a link from the main page where your page best fits. To do this, click 'edit' on the on the main page. With Visual Editor enabled (by default) place the cursor on a new line in the section from which you want to link. Then click the "insert/edit link" button in the visual editor menu. Then insert a descriptive page title ("Page") and description which will be the linked text on the page.