1. Click on Facebook Social Toolkit icon to start Facebook Social Toolkit
2. Select Extract group member emails from extraction tools section.
3. Enter Group ID of Facebook Group from where you want to extract group member emails, to get IDs of public, closed and private groups, please use Facebook ID extraction tool (Facebook ID Extraction tool is already present in Facebook Social Toolkit Chrome Extension, please read about Facebook ID extraction tool to learn how to use it to get group ID)
4. After that, click on "Extract Group Member Emails" button.
5. Wait For "Extract Group Member Emails" tool to extract all group member emails.
6. After extraction is finished