This article lists the steps necessary to change the Sender name, and we also added a short video demonstrating the feature as well!
1) Click Registration in the Side Navigation.
2) Click the Registration Settings button.
3) Scroll to Email 'From' Sender Name in the Registration Options section
4) Type in the Sender name you'd like to use in your Confirmation emails
Note: This does not change the email address that the confirmation email is sent from,all registration emails are sent from the firstname.lastname@example.org email address.