Where do you want to redirect? You can do it at the site level and the page level.
At the site level, go to Sites > your site and click on Aliases. There you can setup a redirect if someone requests a specific domain/page. OR you can use the URL Redirect module in IIS and perform redirects from a global level from there.
If you want to redirect at the page level, find the page in the content tree, click the Properties > Navigation > Menu actions tab and select URL redirection. Then enter the absolute URL you want that given page to redirect to when someone navigates to it.