Google is rolling out a feature signing in to multiple Google accounts simultaneously from the same browser.
Here I m telling You how to Change in Settings ,Follow The Simple Steps ::
1) Sign in Your First Gmail Account ... and Then Go to Account Settings .
2) In the Personal Settings Box ---> Multiple-sign-in click on Edit
3) change The Settings as Shown in Below Image ,Click on The First Radio Button (On-The Multiple google Accounts.....) .and also select all the 4 CheckBoxes After Reading .
Then Click On Save Button.
4) Then You will find out an option for Switch Account ,Click on it.
5) Then Click on the Sign in to Another Account.
6) Finally Login Window will pop up and Enter username and Password for Login Your Another Account.
Similarly You can Login in Multiple google Account as You Wish ,Just click on Sign in Another Account .