aight chief this be the bread and butter of it

  var signInGood = "false";
  readRecords("users", {}, function(records) {
    for (var i = 0; i < records.length && signInGood == "false"; i++) {
      if (records[i].Username == getText("usernameInput")){
        if (records[i].Password == getText("passwordInput")){
          signInGood = "true";
          setScreen("mainScreen");
        }
      } else {
        if (getText("incorrectTxt") != "Incorrect Username/Password"){
        textLabel("incorrectTxt" ,"Incorrect Username/Password");
        }
      }
    }
  });
});

onEvent("signUpBtn", "click", function() {
  createRecord("users", {FirstName: getText("firstNameInput"), LastName: getText("lastNameInput"), Username: getText("createUsernameInput"), Password: getText("createPasswordInput")}, function() {});
  setScreen("studentLoginScreen");
});

onEvent("createQuestionBtn", "click", function() {
  createRecord("questions", {QuestionSet: getText("questionSetInput"), Question: getText("questionInput"), AnswerA: getText("answerAInput"), AnswerB: getText("answerBInput"), AnswerC: getText("answerCInput"), AnswerD: getText("answerDInput"), CorrectAnswer: getText("correctAnswerInput")}, function() {});
  createRecord("questionSets", {QuestionSet: getText("questionSetInput")});
  setScreen("mainScreen");
});