Hover over where it says 'Hi, [Your Name]!' and click on Your Team.
Invite your new team member by entering their email address and clicking 'Send Invitation.' This will email them an invitation to Perfect Audience.
Once they confirm the invitation, they'll be a part of your Perfect Audience account. Note that there can only be one account administrator. You can check or uncheck the box to determine if this team member should receive invoices. Add more team members in the same manner. You're all set!
Note: Team members will have the same access to the account that you have. This include campaign management, billing/credit card information, and access to all advertisers in the account.