Navigate to the Accounts screen. Here, your accounts can be filtered by All, Guests (accounts that have tickets), Donors, Sponsors, Registered without tickets (only applicable if you open your remote bidding link for registration site), and your Event Team.
Under the Event Team section, click "Add Team Member". Here, you can add their first and last name, mobile phone number (this is their account number), email address, and permissions. Permission options include (1) full administrator, (2) auction team, and (3) reservation team.
Once your team members are created, you can hit the 'Email Invite' button next to their name to send them a direct link to the fundraiser.