How To Connect Mobile App To My Shopify Store?

[Demoduct]

I have designed an application for my Shopify store, but I don't know how to connect it. I have made an ios app and am currently on the app store. I want to show my app icon on my Shopify front page so people can connect me through my Shopify store. Please check my website link for more information. 

https://demoduct.com/