SENSE - What file has the settings for the "Checkout" button?

Hello, I am using the sense theme for my store and I need to replace the checkout/complete order button with a custom animated button

I have the HTML,CSS and script file.

I just need some help with how to execute it.

A step-by-step guide would be very helpful.

Thanks in advance

Glad to help. Can you send over the link to your website so I can take a look?

www.thestitchglitch.com

I can do that. Just tell me what to do and I can test it on my duplicate theme first