Option 1
You can directly import contacts from your Yahoo Mail Account by logging in your yahoo account using Option 1 below or you can follow the steps in Option 2 to manually import your contacts from your Yahoo Address Book.

Option 2
Now, to export your Yahoo! Mail address book to a csv file:
- Click the down arrow next to the Addresses tab in the Yahoo! Mail navigation bar.
- Select Import Contacts from the menu.
- Look for Yahoo! CSV under Export and click Export Now.
- Click Save when prompted what to do with the file download.
- Choose the location where you want to save the Yahoo.csv copy of your Yahoo! Mail address book.

I declare that the email addresses provided in the CSV file are from my own email accounts