If you want to change your default choice for an application, go to Settings and make changes.
Go into settings and tap on apps.To change the list filtering between Downloaded Apps, Running Apps or all apps, swipe left and right.
Scroll down the screen until you see the app set as default and then tap on it.Now look for the “Clear Defaults” button. Tap it and then your work is done. That app is no longer a default app.
The process of changing default app is same for every app. Either it’s an app that runs videos or the app which plays music.