Managing a page from your Landing Pages list is very easy. Click the three dots next to the page you want to perform an action on.
You will be presented with the following menu from which you can pick:
The Leads option will take you to the list of leads generated by that landing page. The Analytics option will take you to the detailed stats page for the page in question, where you can see its performance over time.
The Heatmap option will take you to the heatmap generated automatically by the activity on the landing page. For more on that feature, you can refer to this article.
Duplicate option will create a copy of your page. You can Download a page in .instapage format and upload the file when creating a new page.
The Edit URL option will take you to publishing options where you'll be able to republish your page to your desired URL.