You have probably see the following image at your app administration area:
A. When you click on the EmailBat notification you will see the SMTP options to choose:
You have to choose the last option SMTP.
B. You have to enter your SMTP settings:
You have to be very careful, especially with the sending limits that your hosting provider offers to you. If you use more email sends than your hosting provider offers, it will be critical for blocking your account from your web hosting account manager.
C. Save and Test the settings
Firstly, Save your configuration. After that make one Test at the bottom of the page.
IMPORTANT: When you try to Test your email configuration, please put at [From email*] the FROM email address you put at the configuration exactly.