...
The button "Actions" far to the left allows you to edit a list or to delete it
:
Let's see all the options you have when editing a list:
When clicking on "Edit", you will be redirected to a page whose upper part looks like this:
To start with, you can give the list a name and indicate a company (e.g. if you are an advertisement agency and you are managing the mailings of several clients).
...