1 Answer

Log in to your account first and go to the ‘Settings’ tab. Now, go to ‘Accounts and Import’ and from there to ‘Google Accounts Settings’. Under ‘Personal Settings’ you will find ‘Multiple sign-in’. To activate this option, click on ‘Edit’ and a new page will open where you have to agree to a set of terms and conditions – so that you may operate multiple accounts from the same browser at the same time.
Now, return to your inbox and you will find that the e-mail account name at the top-right has turned into a dropdown list. Click on it and it will show you the name of your primary account to which you are already logged, as well as a link that says: Sign in to another account. Click this link and a new Gmail page will open where you can input a new Gmail address and password to access a second account and then a third one. In fact, you can use this system to toggle back and forth among several accounts.

More ideas here >> http://webupon.com/browsers/access-multiple-gmail-accounts-at-the-same-time/