Select Contacts from your Simplero Dashboard
Select Lists from the dropdown menu
Select the list you want to delete
Select the 3 dots in the upper right side of the Navigation Bar. Then press the Delete button:
Click OK on the popup to confirm your request to delete your list:
Note that this will also delete any sign-up forms and auto-responses on that list. However, it will not delete the actual contact records of your subscribers - just their association with the list.