How do I change the product page button?

Shopify stores

Upload the button you would like to use to your store using the template editor. It can be PNG, GIF or JPEG format. You can then visit widget settings and choose your image from the Button image dropdown.

SEOshop stores

You can upload a new button from the  Widget appearance settings. It can be PNG, GIF or JPEG format. After you upload a button and hit Save it will take around 60 seconds for the new image to appear.