Answer:

1.) Create a Gmail account
2.) Open The Best Keylogger
3.) Navigate to Settings/Email
4.) From : Who is sending
5.) To : Who is recieving the emails.
6.) Subject : Subject of the email
7.) SMTP Server : smtp.gmail.com
8.) Port : 587
9.) UserName : Here you write your gmail NAME only, like if your gmail is 'SomeName@gmail.com' then you write 'SomeName'
10.)Password : Your gmail password
11.)Remember to check the 'Enable SLL' checkbox if you are using Gmail.
12.)Press 'Save' Button
13.)Press 'Send Test' Button to test it.