The fastest way to populate your address list is using the “Import Address List CSV button, which leads to this screen…
You need to prepare a comma separated values file with the first row as column headers.
Check “Overwrite current address details?” if you are wanting to replace what is currently stored.
Click the “Upload” button to upload your file.
On the next screen you will get the opportunity to map the columns to the plugin. Leave as unused any that you can’t match.
Then click save and you are all done.