To achieve this you have to make some modification in code.
First you have to create a option with slider for image href and after that in code have to call it so if banner image have banner then on click it will redirect to specific location.
Katy here from Shopify. I hope all is well with you.
As @Guleria indeed mentions, this will require some editing to your theme’s code.
Usually we don’t recommend this set up for your slideshow as it can, at times take away from the call-to-action aspect here. From a UX perspective, a button is use to guide the users attention towards it.
However looking at your own store, I can see that your image does have text on it, so can see why you would like this to be clickable. I would just like to share this as food for thought should you adjust your images at a later stage/ after your sale has finished.
If you’d like a hand with setting this up, it is something that our Theme support can help you out with as part of your free design time. I’ve sent you an email to verify your details, if it is something you would like to explore now. Though, you may like to save this design time for another occasion, the choice is totally up to you.