If you are struggling with Yahoo Mail Not Working, you can force stop and restart the app so that Yahoo can work properly again. Firstly, press the Home button and then the Menu button. After this, tap Settings. Tap Apps and find and tap the Yahoo app that's not working. Now tap Force stop and tap it again to confirm. Lastly, re-launch the app and check if the issue is resolved. Also Read:- how do i talk to a person at verizon customer service add bellsouth email to iphone