Hi! Everyone, hope you all are fine.
The feature by default comes off
mode. By going to your Google account
page you will see in the Personal Settings
options there is a new settings which is Multiple sign-in
setting, (if it’s not there then it will be soon available) near the Multiple Sign-in setting you will see its written Change
link, click on it.
After clicking on the Change link you will be seeing Google is informing you that this is an advance feature and you can only use multiple sign-in to the following Google Product and Services.
When multiple sign-in get enables you will see a Drop down button at the top-right beside your email ID, by which you can switch to your one account to another intently and add your other Google accounts. You can only add up to three Google accounts. The account which you use to sign-in to another account, the 1st account will become your default account.
e.g.: you have 1st sign-in to the email@example.com then using this ID you have signed in to the firstname.lastname@example.org. So, the email@example.com will become your default account.
These are other some things you may need to know or you can take a help from Google Help Center
1. If you use any product or services which don’t support this feature, you will automatically get into your default account for that product or service.
2. Is you once signed out from any account in any product you will automatically will signed out from all other accounts.
3. Enabling the multiple sign-in option will Disable your Offline products like Offline Gmail and Offline Calendar, as well as any browser bookmarks you’ve set to link to your accounts.
To add other accounts 1st enable the multiple sign-in setting. Once you have enabled the multiple sign-in for one of your Google account. Now here how you will able to add the other accounts to your 1st accounts. Go to the product or service which supports multiple sing-in and sing-in with your account which is enabled with multiple sign-in. Now you will see a drop down button beside your email ID at the top-right click on it. Select the ID you want to switch with or select the Sign-in to another account. Now entre your ID and password of which you want to access with and click on Sign In.
Let us know what you think about it.