How do I signup two/multiple people under one email?

As part of the Form Questions, Users will be asked if they are Registering as an Individual, if they are joining an existing Group, or if they would like to create a new Group to join.

You can register a group of people under one email, one account, if the Opportunity signup process has it enabled. If joining or creating a number-based group, you are only required to list one email address and the number of people in your group. Those members of the group do not need to provide an email, but they cannot log in and take actions within the system. 

If you need to have multiple users log into the system, but only have one email address for those users, you can use our Email-based group feature. You can find more info on it here.