LG AS740 - Manual (Page 136)

135 Google Talk TM
To return to your friends list
You can return to your Friends list when chatting with a friend, so that
you can invite another friend to chat, add a friend, and so on.
▶ Press the Menu Key and touch Friends list.
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 also extend
your battery life.
▶ From your Friends list, press the Menu Key and touch More >
Sign out.
You will no longer receive chat notifications or see others’ Google Talk
status in other applications, such as Gmail
TM .