STEP 1

Open Pidgin

STEP 2

Click Accounts->Manage Accounts->Add

STEP 3

Add the following

Protocol: XMPP Screen name: You’re Google Talk screen name without @gmail.com Server: gmail.com Password:  You’re GMail password

STEP 4

Click on the Advanced Tab and then add the following

Connect server: talk.google.com

STEP 5

Click save and it should work.