Hi Vicky,
When you say that you have created an application for the website, do you mean that you have created a native app (IOS orANDROID ... ), or have you made your website mobile responsive ?
If it is mobile responsive then simply use AppMeasurement.js library to implement Adobe Analytics.
If it is a native app then you should use one the SDK at your disposition : GitHub - Adobe-Marketing-Cloud/mobile-services: Native Mobile SDKs, dev tools and example apps.
IOS doc: Marketing Cloud Help
Android doc: Marketing Cloud Help
Or have you used PhoneGap or Xamarin ?
Anyway please provide more details and we can point you to the right direction.
Best regards.
Alexis Cazes