while (true) {

    var username = prompt("Type what you want your username to be");
    var password = prompt("Type what you want your password to be");
    var userConfirm = confirm("Do you want your username to be: " + username);
    var passConfirm = confirm("Do you want your password to be: " + password);

    if (passConfirm === true) {

    	break;

    }

    if (passConfirm === false) {

    	continue;

    }

    if (userConfirm === true) {

      break;

    }

    if (userConfirm === false) {

      continue;

    }
  }

while (true) {

    var userLogin = prompt("Username:");
    var passLogin = prompt("Password:");


    if (userLogin === username) {
    	if (passLogin === password) {
    		alert("Succesfully signed in :D");
    		break;
    	}else if (passLogin !== password) {

    	alert("Your password is incorrect");
    	continue;
    }


    }else if (userLogin !== username){

    	alert("Your usernname is incorrect");
    	continue;

    }


}