Thank you for reaching out in the community about this. This should be in the Slideshow section of the theme editor. Once you've added the slideshow section in your theme editor, you will go into the Slideshow section, and within each slide there should be a box to input a button label and a button link. Let me know if you need any further help with that!
Are you using the Prestige theme as well? Would you have an example of what that would look like?
Thanks! This should be possible with the use of some custom coding. As this is a third party theme, I'd recommend reaching out to the theme developers first to see if this is a customization they can support. You can find their contact information here. If they're unable to support you with that request, then you can reach out to a Shopify Expert and have them do this for you. Hope that helps!