To create a mailing list from a spreadsheet the spreadsheet will need to have a column with all the emails in it.
Select the mailing list to which the new emails are to be added, in this case the Quinn European Long, by selecting Add
2. The following screen will appear into which copy and paste the column into the box. You may need to scroll to the bottom of the page to access the box.
3. The new emails are added to the mailing list "Quinn European Long" once the Add to Mailing List button is clicked.