This answer shows you how to remove an email account from your Android Smartphone.
Android operating systems will look different on every phone. These screenshots are designed to give you a general idea of what to do, but the process may be slightly different depending on your phone model and operating system.
Go to Settings
From the Home screen swipe down and tap on the Settings gear icon.
Go to Accounts
Scroll down and tap Accounts.
Select Account to be Removed
Select the account you wish to remove from your device. This user has chosen to remove a Microsoft Exchange Account.
Find More Options
Tap Remove Account
Confirm Account Removal
Tap Remove Account again to confirm the request when prompted.