Do you want to edit the lists for a contact? There's an easy way to do it, right from the Contact Details page! To get to the Details page, just click on the name of the contact.
Once you are viewing the details of that one contact you will see the lists below each email address that contact has (you can have up to 5 email addresses for a contact). You just have to click the x in the blue bubble next to each list that you want to remove. Take a look: