I am not able to change my root password on Mac
There is no root user on macOS. You can just use sudo and your admin account password for adb — no need to change any passwords. It’s also very non-typical to run apps as root, so you might need to check with the app maker if you’re considering trying that to verify you are installing the app properly in the first place or don’t have a different error to solve than permissions. 

You could have a problem if your Mac account has no password, so set one in the users pane of system preferences. 

You can install most command line tools without root, Android sdk tools, too: https://stackoverflow.com/questions/2677431/where-to-install-android-sdk-on-mac-os-x