Question: "how do you make it so when you click on newgame you to write in a username and password. i need a code or some thing a.s.a.p please"

Answer: You are not very specific. Do you use GML? These kind of thing are ideally done by the function get_string, but to use it, you need to know how to use variables. Here is an example code:

name = get_string("Please enter your username:","";
password = get_string("Please enter your password:","";

if (name=="death-droid" && (password=="secret" {
room_goto(room_play);
}

<b>Also take a look at:</b>
http://gmtutorials.com/article/easy/register-a-user/
http://gmtutorials.com/article/advanced/input-textbox/