Hi Kerstin and Charlie,
This can be accomplished within the confirmation Landing Page's settings which is pretty awesome because you don't have to know any special code. From within your Landing Page > click on the gear menu in the top right corner and select Settings. This allows you to choose whether the landing page stays constant, redirects to another page after x seconds or closes out after x duration of time. If you select the "Automatically re-direct after x seconds", you can confirm the # of seconds and the URL that the visitor is redirected to (screenshot below).
Image may be NSFW.
Clik here to view.
Hope this helps!
E
