If you can't send mail with your Gmail account for that reason, it's unlikely that you're entering the wrong SMTP settings.
Ọ bụrụ na ịnweghị ike izipu ozi na akaụntụ Gmail gị maka nke ahụ, ọ gaghị ele gị anya na ị na-abanye na ntọala SMTP na-ezighị ezi.