SMTP Server: smtp.gmail.com
Username: email address i.e. email@example.com
Password - Your email password used to sign in to your Gmail account
SMTP Port - This would either be 465 (SSL) or 587 (TLS) it can vary system to system depending on network restrictions. If your test email failed and you have confirmed all details above are correct then if you are using Port 465 please try using Port 587 instead and test again.