Access the the unified settings page from the user dropdown.
From there, select Users underneath the Organization grouping.
To remove a user, click the Remove button in the users table.
From the unified settings page, select Invites underneath the Organization grouping.
To invite a user, add their email and click Send invite. When a user is invited, they will receive an email allowing them to accept the invite.
To resend an invitation, click the resend icon. To revoke an outstanding invite, click the trash can icon.