You will find an icon to the right of the Old URL field which has a tool-tip to let you know it is for viewing your Site Address History. Clicking this icon will open a history report similar to the image below. This list will contain any changes made to the Site Address (URL) via your General Settings in the WordPress admin since this plugin has been activate on the site. The results will be limited to the last 10 changes in order of newest to oldest. Clicking the “Use” button at the right of any item will automatically fill out the Old URL and New URL with the values from that row.