Click the arrow in the password field to log in.
You should see the panel on the right side of the page reflect that you have all your contacts selected.
Your contacts might automatically save as a . vcf file in your “Downloads” folder; if not, a file manager window will pop-up for you to select where to save the contacts file and what to name it.
Log in if prompted. You’ll need to log in with the same Google account that you set up your Android with.
Your file manager should open.
If you’re already signed into the same Google account on your Android, the newly imported contacts will appear momentarily, depending on your Wi-Fi/data connection and sync settings. To force a sync, go to Settings > Accounts > Google Account > Account sync > ⋮ > Sync Now. To add the Google account on your Android, open Settings > Accounts > Add Account.
You can also tap the “Contacts” tab from your phone app. Since you’ll be going through each contact with this method, it’s probably best if you don’t have a lot of contacts.