Hi there,
Thank you for getting in touch with us, we do appreciate your time.
Unfortunately you cannot import addresses using the Free basic version as the Import feature is a Pro feature which requires you to have the Pro Add-on: https://www.wpgmaps.com/purchase-professional-version/
With regards to an example of what your CSV file should look like, please see our example CSV file here: https://www.wpgmaps.com/wp-content/uploads/Example.csv
You may also find our Importing documentation here: https://docs.wpgmaps.com/importing-files
I hope this helps?
Kindest Regards,
Matthew