In the PAM Predefined Content (If you don't have that folder in your library, click the "Browse out-of-the-box content button on the home screen) there is a "Send Task URL" process under the "User Interaction Forms" folder that demonstrates how to send notifications. If you want to send to multiple users or a group of users, I would define that in a variable or even in an external dataset so that you can update that list of email addresses as needed. Then reference that variable from your email operator to email everyone in the group.
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