Hello @SHERRYL039,
Thank you for reaching out to us today!
I apologize for any inconvenience. At this time you are unable to customize the "Register Now" button on the registration page for an event. I am glad that you brought this to our attention as something that you would like to do. I will be sure to submit this as feedback to the appropriate team.
Feel free to reach out to us if you have any questions or concerns. We are here to help!