List fields are used in Classic Contact Forms

Steps

Select My Apps in the top menu
Go to Lists in the My Apps sub menu
You arrive on the Manage Lists page
Select Create new list
On the Create new list page
1. ensure that each item in the List has a different Priority number
2. Each priority number should increase sequentially from 1
3. click the Add item button to add new items to the List
4. Press Save

Create a List field