The 'list' is where you'll store your new leads for email marketing. To create a new list bucket, log into engage and follow the steps below:
1.) Click on the 'Contacts' menu item, and under the 'Manage Contacts' button in the upper right, select Create List.
2.) Choose a name for your list click 'Save'
That's it, once you have a list created, you can begin building landing pages using Insty.pages or create forms inside Engage. To create a form, checkout the KB article called Creating Forms with Engage Pro.