To email participants assigned to a specific group in the Group Assignment tool, please use the following steps:
  1. Click Home tab
  2. Select Reports beneath the appropriate season
  3. Select New custom report
  4. Click Customize > Edit Columns
  5. Search Group Assignments on the left Available columns and move to the right Select columns
  6. Press Save
  7. Click Group Assignments column to sort report
  8. Mark the checkboxes next to each desired name
  9. Press Email selected people

For more information, please see the following articles: