Hi @Zeb1 ,
The theme you are using does not have a cart icon. You will have to manually add the cart icon through liquid coding. You can try adding this code snippet right after the Search Icon snippet code. Try visiting this forum for more info: https://community.shopify.com/c/Shopify-Design/Missing-shoping-cart-icon-in-header/td-p/506389
I highly suggest duplicating the theme before working with the codes. If you need help with this you can contact us https://bit.ly/36CgHKQ.
Hope this helps.