To invite new users just head over the Team page in the nav and then click Invite User in the top right corner.
From there you'll just add the email address of the person you want to invite, assign them a Role (details on Roles are below), and click Send Invite. If you are inviting more than one user we have added a handy Invite More toggle to make it easy.
Setting Up Streams for Teammates
As part of the invite flow, you can set up a Stream for a teammate, even including only their accounts using the My Accounts Smart Tag. You can also easily add streams after they're inviting by: