Hi Maureen, I'm sorry to hear this is happening. Can you try searching for the contact using the search box on the left of the main contacts page? Once you find it, click into their details and then look under the email address. If they are part of any lists they will show here. You can also add them to a lists here. If you would rather just add them to a list from the list view, just check off the contact(s) and click "Add to Email Lists". Check off any lists you want to add them to!