LG LGVS920 - Manual (Page 101)

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Communication
Talk
To open Google Talk and sign in
 From the Home screen, tap the Apps Key > Talk .
When you first open Google Talk, your Accounts list will be displayed.
This list includes all of the Google Accounts you’ve added on your
device. Tap the account you want to use.
Tap here to add account.
To sign out of Google Talk
You can sign out of Google Talk. For example, if you want to limit Google
Talk conversations to your computer. Also, signing out can extend your
battery life.
Tap here to search.
Tap here to add friend.
 From your Friends list, tap the Menu Key > Sign out.
You will no longer receive chat notifications or see others’ Google Talk
status in other applications, such as Gmail
TM
.