On the "Data And Responder For" page, click "Add Responders" on the grid.
"Add New: Quick" option allows you to easily add just one-two Responders at a time. This option is especially handy when you need to add a Responders with no email address.
Don't forget to click "Save" when you're finished.
(Everyone you add here will show up on the People List, so you can edit this listing later, if required.)