In all honesty, it's always a hassle to go through rooting your phone in order to reveal a wifi password. But you don't really have to do so. You can simply refer to this article and get your Android phone all set up yourself. There are many ways to access a WiFi password without root, and we're explaining it in a simple way here:
https://androidlair.com/how-to-reveal-a-wifi-password-android-without-root/