From the drop-down
Select an "Address Book" from the dropdown menu. This address book will be the one that you will import the contacts into.Next, select Format of File.
If you are not
importing contacts from a CSV file that you exported from another email client,
Choose the character
set, in most cases it will be Unicode UTF-8, but there are several other
languages to choose from. Depending on your language/locale, choose the
character set that best fits.
Click Upload to
locate the file that you want to import.
Note: the file should be in CSV format. This means that when you are saving a contact list in Microsoft Excel, you should save it as a ".CSV" file. View more information on how to create a .CSV file with contacts here. – links to CSV article
Verify the information and select Next (fields are what you put in the columns and rows on your .CSV file such as first name, last name, email, etc.)
You will find your imported contacts in the Address Book you selected them to be imported into.