Power & Source of Big Ideas

Hi, sorry, actually I've tried to solve it but I'm unable to do that. If get the solution let me know.
Hi, I've tried to solve it but unable to do that, sorry, if you get the solution let me know.
To change the app's default setting, find and tap Settings > Apps & notifications > Default apps. Tap the type of app you want to set, and then tap the app you want to use as default.