When I invite people to my account how are they notified?
Recipients of your invitations will be notified via the email address you submitted in the ‘new user’ window. They will be provided with a login link, username, and password to your account. The email itself is customized with your site color and logo.
Setting a password for a new user is optional and if you do not want to send it by email, you can modify the content of the invitation in the account settings (How to customize email messages for your users?)