Every Android device needs a Gmail or Google Account when users first set up his/her device. This is called the Primary Google Account. Sometimes Android Smartphone users need to change their Google account. For that first of all you need to remove your previous account. Here is the process to remove your Google Account –
Go to your “Settings” menu >
Select “Accounts” option >
Tap on the “Google icon” >
Here you will found your “Google account user name or ID” >
Select your ID and go to next page >
Tap on the option key and then “Remove account”.
Now you can Add a new Account for access Google services in your device.