In Givebacks, like most other online apps, an email address can only be associated with one person/profile because it is the unique identifier for that person.
Students are not required to have an email address.
If you need to enter nonstudent members and do not have a second email address, one member can be entered using just a phone number, however, please note that this will mean that this person will not have the ability to log in to Givebacks under their own profile.
If you do not have a phone number for the second person, you can enter them using a made-up number or "dummy" information.
Questions? Contact Givebacks Support.