Change action using

[AC Question]

was changing a pic on my home page and I was asked complete action using and I pressed use always but now I want to undo this and I don't know how to

 

[B. Diddy]

Welcome to Android Central! If you know which app you used to make default, go to Settings>Apps, select that app, and tap Clear Defaults. If you're not sure, then go to Settings>Apps, tap Menu, then Reset All App Preferences (which will clear all app defaults).