To amend a list, navigate to Documents > Settings > Expected Visitors
From here a new spreadsheet can be uploaded, replacing the original list.
Select Edit for the list you would like to update.
Select Export List to download the current spreadsheet of email addresses
Open the spreadsheet and enter the updated list of email addresses before saving the file
Select Choose File to find and upload the updated spreadsheet
If you wish to report on historic data, it is recommended that you first download the data or upload a new list. Read more about expected visitor list data here.