i can't be done. You have to reimage your phone and set it all up as it's a brand new factory set phone.
To have more than one Gmail account on your Galaxy S3, you can go in Settings>Accounts, and go to "Add Account". From there, you would add "Google" or "Gmail", in the prompts press "Existing", and follow the instructions from there.
Samsung is an Android based smartphone series. It contains all the accounts in the settings. You have to select the account you want to sign out from there.
Samsung Phone contains the OS Android in it. You have to go to your email ID. In the ID you have the settings to change your password.
You can easily sign out in settings in Galaxy 3. The settings have a group called Accounts. There in Google accounts you can find sign out.
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Amazon.com is a independent organisation of e-commerce. It does not have Gmail but can logged in via Gmail. Amazon accounts can be created via Gmail accounts.
You can put any name for your Gmail in iPod. Gmail accounts have a unique name to them. You can add many accounts in one place.
You cannot search Gmail accounts easily. There is no list of people who are on Gmail. This list would hurt the privacy of the owners.
People could hack your Gmail accounts. Gmail accounts could contain passwords, bank statements etc. Money could be hacked via these google accounts.
no
Gmail accounts are individually owned. You can sign up for a Gmail account directly from their website. The accounts are free and can be customized for sending and receiving mail.
No, there is only a main account. No sub accounts are present in Gmail. You have to work within a single account only.