To Setup Yahoo Mail on Android phone, you need to press and hold the menu button on an Android device. Go to “Settings”>> “Add account”. Tap on your email, provide the complete Yahoo email address and password. Hit the “ Next” button. You can adjust the synchronised settings optionally here. Proceed with onscreen instructions and complete the task. If you are still having trouble setting up Yahoo mail on Android, call the experts.
https://www.yahoosupport.co/blog/set-up-yahoo-mail-on-android/