You can visit your published website by entering its web address (URL) in a web browser, or you can visit it from iWeb.
In iWeb, click the Visit button in the toolbar at the bottom of the iWeb window.
If you have more than one published site, the site that includes the currently selected page is the one that opens.
To go to a specific page of a website, select the page by clicking it in the sidebar at the left of the iWeb window, and then hold down the Option key while you click the Visit button in the toolbar.
Click the Visit Site Now button in the dialog that appears when you publish your site.