If an applicant does not have an e-mail address, you need to create an invitation and click the ‘No E-mail Address’ button. Then, you must immediately complete the entire enrollment form on that member’s behalf. This should only be done if the member has completed and signed a paper version of the enrollment form. Alternatively, if the applicant has access to the internet, the applicant can sign-up for a free e-mail address through one of the many free providers.
See also:
How does the Invitation feature work?
Why do I need to provide this information on AmeriCorps members?
What should I do if the e-mail address is invalid?