New Thread for New User

[ICStar]

hello everyone! i want to do this: when a new member register i will redirect them a new page which is "mysite.com/newmemberform.php". when the form is filled and submitted, i can send a pm to my account. but i need to open a thread. briefly, when a new member submit this form, how can this user create a new thread "NEW USER" forum automatically? thanks everyone, help me please.