Subject Line more than one Edit field

procedure Form1_Button2_OnClick (Sender: TObject; var Cancel: boolean);
begin
if SendMail('smtp.mail', 'email@qxxxxxxxxx', 'password', 465, 'xxxxxxxxxxx', 'email@icloud.com; email@gmail.com', Form1.edTo.Text, 'Message') then
            ShowMessage('Message 2 of 2 sent');
end;

Good Day all,

How can I add more than one edit field in the subject line?
For example, Form1.edSub1.Text and form1.edSub2.text and form1.edSub3.text

I want to use more than one edit field in my subject line when the email is sent. I know how to do it in VB.net but not so sure here as I am new to pascal.