To make the first page for the site, select the Welcome template and click Choose.
Note
Although you are starting with the Welcome template, you can choose any of the templates as your site’s first page or homepage.

iWeb displays the Welcome page in the webpage canvas. The left pane shows the sidebar, which lists the sites and pages you’ve created. At the moment, your new website is called “Site” and its one page is named “Welcome.” The right side shows the Media Browser. The newly added webpage contains both placeholder text and images that will be replaced with your own content as you build the site.
Note
You can change the theme of your website at any time. Select a page in the sidebar and click the Theme button to apply a new look to the page. It’s a good design guideline to stick to one theme per website.