Hi @4peaksdesign,
If you already have contacts in your account, you should be able to export the contacts, then import them again into the list you want to use. When you are inside a segment or list, there is a button in the top right corner that says Manage Segment. If you click the arrow, the first option in the drop down is Export Segment/List to CSV. Once you have all the contacts exported, you can then import them to a list. First create the list by clicking on the button that says Create List/Segment, found in the top right corner when you are in the List & Segment section of your account. After creating the list, you will have the option to import contacts. Hope this helps!