1. Sign in to Google Account at https://www.google.com/account
2. In Google Account home, search App passwords in the website search bar
3. In App Password page, enter an app name.
4. A new password will be generated, copy the password and keep it secret.

Then, in admin settings, set as follows:

1. From email: youremail@gmail.com (Change according to your email)
2. From name: your name
3. Protocol: smtp
4. SMTP Host: smtp.gmail.com
5. SMTP User: yourname@gmail.com
6. SMTP Password: App Password (generated in above steps)
7. SMTP Port: 465
8. SMTP Crypto: empty (Remove tls, if using port 465)