Why won't my Buy with Prime button show on my dawn themed store?

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I'm trying to set up buy with prime with my shopify store, it's dawn themed. I've gone through all the steps but the button just won't show up on the product pages. On the troubleshooting page it just says that the product detail page isn't supported or something and so I tried to follow the steps to change the code but it didn't do anything. Does anyone know how to fix it/what code I need to add and where?