Here you can see a list of all available newsletters. You can manage the items in the list using the appropriate icon on the left side - edit (), delete () and clone (). New newsletters can be created by using the New newsletter link.
If there is a large amount of displayed newsletters, you can filter them by their name using the filter above the list. After clicking the icon in the header of the Actions column, a context menu is displayed, offering options for export of listed data to various types of files.
More resources can be found in Developer's Guide -> Modules -> Newsletters -> Overview.