Please click Contacts >> Import/ Update Contacts >> From Outlook CSV File.
Feel free to download our Blank Outlook CSV from this page. Paste your contacts into the CSV. Keep the headers EXACTLY the same. Save as a CSV if you are on a PC, and as a Windows Comma Separated (.csv) on a mac.
Attach the file, choose the proper Distribution List from the dropdown menu. Then click Upload.
For a more detailed look into how to import contacts, please see our webinar on the topic here: Feature Focus: Importing your contacts