Typical settings for using G Mail for SMTP out:
- Your full email address for login (and your password)
 - Server: smtp.gmail.com
 - Port: 465 (SSL required) or 587 (TLS required)
 - Reference: https://support.google.com/a/answer/176600?hl=en
 
Troubleshooting:
- Password incorrect = It's possible you'll need to set an App password as described here: https://support.google.com/mail/answer/185833 which may first require you allow less secure apps as described here https://support.google.com/accounts/answer/6010255
 
If you still need help no problem - we can help via a remote assist