Click on the Help Me button at the top of the page which will reveal a pop-up window with various email provider options. Select the correct email provider option which then populate SMTP Server and Port fields automatically with the correct details. 

Then populate the rest of fields within the page such as the SMTP Username and Password (email ID and email password), Default Email Reply To and From (email ID you would like to receive responses from and to display when emails are sent out). Tick the SSL box and then click Save.