Upgrade the plugin
To get the update:
1. Log into your WordPress Admin area.
2. Click on Plugins -> Installed plugins.
3. Scroll down to PW WooCommerce Let’s Export! and click “Check for updates.”
4. The page will refresh, then scroll back down and click on “Update.”
5. Important: Since there is a new field, after the update has finished updating click on “Deactivate” and then “Activate” to ensure that the new field appears.