First, you'll need to decide which capture page it is in the system that you'd like to edit the tour page visitors are re-directed to after they opt-in. If it's your main website URL lead capture page you'd like to edit the re-direct for, go to My Marketing Pages > My Links and see which lead capture page is set as your main website URL. Then, go to My Marketing Pages > Lead Capture and find this lead capture page in the list.
To edit the tour page re-direct next to a lead capture page, locate the box to the right of the lead capture page. Under the "Tour Page" heading, click "Edit" to select a tour page from the drop-down list, You can also set up a custom re-direct to a page outside of the marketing system in this manner.
You can view all of your tour pages by going to My Marketing Pages > My Links. Just click the link under any title to view that tour page.