Email settings for gmail
SMTP Server: smtp.gmail.com
Port: 587
Username/Password from gmail account
Make sure "Use SSL/TLS" is checked.
Click "Send Test Email" to verify.
If that doesn't work you will have to create an app password:
https://support.google.com/mail/answer/185833?hl=en
Or you may need to change your gmail settings to allow less secure Apps:
https://support.google.com/accounts/answer/6010255?hl=en